diff --git a/composeApp/src/commonMain/composeResources/values/strings.xml b/composeApp/src/commonMain/composeResources/values/strings.xml
index fd9b1bf..a28bf69 100644
--- a/composeApp/src/commonMain/composeResources/values/strings.xml
+++ b/composeApp/src/commonMain/composeResources/values/strings.xml
@@ -185,9 +185,10 @@
     <string name="roll_history__item__difficulty">Difficulté</string>
 
     <string name="chat__diminished_change">%1$s passe à %2$d d'état diminuée</string>
-    <string name="chat__characteristic_change">%1$s passe à %2$d %3$s</string>
-    <string name="chat__characteristic__hp">Hp</string>
-    <string name="chat__characteristic__pp">Pp</string>
+    <string name="chat__characteristic_change__hp_down">%1$s subit %2$d point(s) de dommage</string>
+    <string name="chat__characteristic_change__hp_up">%1$s récupère %2$d point(s) de vie</string>
+    <string name="chat__characteristic_change__pp_down">%1$s utilise %2$d point(s) de pouvoir</string>
+    <string name="chat__characteristic_change__pp_up">%1$s récupère %2$d point(s) de pouvoir</string>
 
     <string name="settings__title">Paramètres de l'application</string>
     <string name="settings__reset_action">Paramètres par défault</string>
diff --git a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/repository/campaign/CampaignStore.kt b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/repository/campaign/CampaignStore.kt
index d763745..0b1a648 100644
--- a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/repository/campaign/CampaignStore.kt
+++ b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/repository/campaign/CampaignStore.kt
@@ -123,7 +123,7 @@ class CampaignStore(
                     is CampaignMessage.UpdateCharacteristic -> updateCharacteristic(
                         characterInstanceId = instanceId,
                         characteristic = factory.convertFromJson(json = message.characteristic),
-                        value = message.value,
+                        value = message.newValue,
                     )
 
                     is CampaignMessage.UpdateDiminished -> updateDiminished(
diff --git a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/composable/character/characteristic/CharacterDetailCharacteristicDialogViewModel.kt b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/composable/character/characteristic/CharacterDetailCharacteristicDialogViewModel.kt
index cd859ac..611c61c 100644
--- a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/composable/character/characteristic/CharacterDetailCharacteristicDialogViewModel.kt
+++ b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/composable/character/characteristic/CharacterDetailCharacteristicDialogViewModel.kt
@@ -11,7 +11,9 @@ import com.pixelized.shared.lwa.model.AlteredCharacterSheetFactory
 import com.pixelized.shared.lwa.model.alteration.FieldAlteration
 import com.pixelized.shared.lwa.model.campaign.Campaign
 import com.pixelized.shared.lwa.model.campaign.Campaign.CharacterInstance.Characteristic
+import com.pixelized.shared.lwa.model.campaign.damage
 import com.pixelized.shared.lwa.model.campaign.factory.CampaignJsonFactory
+import com.pixelized.shared.lwa.model.campaign.power
 import com.pixelized.shared.lwa.model.characterSheet.CharacterSheet
 import com.pixelized.shared.lwa.protocol.websocket.CampaignMessage
 
@@ -65,6 +67,9 @@ class CharacterDetailCharacteristicDialogViewModel(
         val sheet = characterSheetRepository.characterDetail(
             characterSheetId = characterInstanceId.characterSheetId,
         ) ?: return
+        val characterInstance = campaignRepository.instance(
+            characterInstanceId = characterInstanceId,
+        )
         val alterations = alterationRepository.alterations(
             characterInstanceId = characterInstanceId,
         )
@@ -85,7 +90,11 @@ class CharacterDetailCharacteristicDialogViewModel(
                 characterSheetId = characterInstanceId.characterSheetId,
                 instanceId = characterInstanceId.instanceId,
                 characteristic = characteristicJson,
-                value = when (characteristic) {
+                oldValue = when (characteristic) {
+                    Characteristic.Damage -> characterInstance.damage
+                    Characteristic.Power -> characterInstance.power
+                },
+                newValue = when (characteristic) {
                     Characteristic.Damage -> alteredSheet.maxHp - value
                     Characteristic.Power -> alteredSheet.maxPp - value
                 },
diff --git a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/TextMessageFactory.kt b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/TextMessageFactory.kt
index 34b4bbc..3b6a121 100644
--- a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/TextMessageFactory.kt
+++ b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/TextMessageFactory.kt
@@ -7,21 +7,22 @@ import com.pixelized.desktop.lwa.ui.screen.campaign.text.messages.DiminishedText
 import com.pixelized.desktop.lwa.ui.screen.campaign.text.messages.RollTextMessageUio
 import com.pixelized.desktop.lwa.ui.screen.campaign.text.messages.TextMessage
 import com.pixelized.shared.lwa.model.AlteredCharacterSheetFactory
-import com.pixelized.shared.lwa.model.campaign.Campaign
 import com.pixelized.shared.lwa.model.campaign.CampaignJsonV1.CharacterInstanceJsonV1.CharacteristicV1.Damage
 import com.pixelized.shared.lwa.model.campaign.CampaignJsonV1.CharacterInstanceJsonV1.CharacteristicV1.Power
-import com.pixelized.shared.lwa.protocol.websocket.SocketMessage
 import com.pixelized.shared.lwa.protocol.websocket.CampaignMessage
 import com.pixelized.shared.lwa.protocol.websocket.GameMasterEvent
 import com.pixelized.shared.lwa.protocol.websocket.RestSynchronisation
 import com.pixelized.shared.lwa.protocol.websocket.RollMessage
+import com.pixelized.shared.lwa.protocol.websocket.SocketMessage
 import com.pixelized.shared.lwa.protocol.websocket.ToggleActiveAlteration
 import com.pixelized.shared.lwa.protocol.websocket.UpdateSkillUsageMessage
 import lwacharactersheet.composeapp.generated.resources.Res
-import lwacharactersheet.composeapp.generated.resources.chat__characteristic__hp
-import lwacharactersheet.composeapp.generated.resources.chat__characteristic__pp
-import org.jetbrains.compose.resources.getString
+import lwacharactersheet.composeapp.generated.resources.chat__characteristic_change__hp_down
+import lwacharactersheet.composeapp.generated.resources.chat__characteristic_change__hp_up
+import lwacharactersheet.composeapp.generated.resources.chat__characteristic_change__pp_down
+import lwacharactersheet.composeapp.generated.resources.chat__characteristic_change__pp_up
 import java.text.SimpleDateFormat
+import kotlin.math.abs
 
 class TextMessageFactory(
     private val characterSheetRepository: CharacterSheetRepository,
@@ -80,30 +81,21 @@ class TextMessageFactory(
                 val sheet = characterSheetRepository.characterDetail(
                     characterSheetId = message.characterSheetId,
                 ) ?: return null
-                val characterInstanceId = Campaign.CharacterInstance.Id(
-                    prefix = message.prefix,
-                    characterSheetId = message.characterSheetId,
-                    instanceId = message.instanceId,
-                )
-                val alterations = alterationRepository.alterations(
-                    characterInstanceId = characterInstanceId,
-                )
-                val alteredSheet = alteredCharacterSheetFactory.sheet(
-                    characterSheet = sheet,
-                    alterations = alterations,
-                )
+
+                // We are talking about damage / consumption there so old value have to be put first.
+                val value = message.oldValue - message.newValue
+
                 CharacteristicTextMessageUio(
                     id = "${message.timestamp}-$id-Characteristic",
                     timestamp = formatTime.format(time),
+                    label = when {
+                        message.characteristic == Damage && value < 0 -> Res.string.chat__characteristic_change__hp_down
+                        message.characteristic == Damage -> Res.string.chat__characteristic_change__hp_up
+                        message.characteristic == Power && value < 0 -> Res.string.chat__characteristic_change__pp_down
+                        else -> Res.string.chat__characteristic_change__pp_up
+                    },
                     character = sheet.name,
-                    value = when (message.characteristic) {
-                        Damage -> alteredSheet.maxHp - message.value
-                        Power -> alteredSheet.maxPp - message.value
-                    },
-                    characteristic = when (message.characteristic) {
-                        Damage -> getString(Res.string.chat__characteristic__hp)
-                        Power -> getString(Res.string.chat__characteristic__pp)
-                    },
+                    value = abs(value),
                 )
             }
 
diff --git a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/messages/CharacteristicTextMessage.kt b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/messages/CharacteristicTextMessage.kt
index 2c28c30..9e31927 100644
--- a/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/messages/CharacteristicTextMessage.kt
+++ b/composeApp/src/commonMain/kotlin/com/pixelized/desktop/lwa/ui/screen/campaign/text/messages/CharacteristicTextMessage.kt
@@ -11,17 +11,16 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import com.pixelized.desktop.lwa.ui.theme.lwa
-import lwacharactersheet.composeapp.generated.resources.Res
-import lwacharactersheet.composeapp.generated.resources.chat__characteristic_change
+import org.jetbrains.compose.resources.StringResource
 import org.jetbrains.compose.resources.stringResource
 
 @Stable
 data class CharacteristicTextMessageUio(
     override val id: String,
     override val timestamp: String,
+    val label: StringResource,
     val character: String,
     val value: Int,
-    val characteristic: String,
 ) : TextMessage
 
 @Composable
@@ -53,12 +52,7 @@ fun CharacteristicTextMessage(
             style = MaterialTheme.lwa.typography.chat.text,
             overflow = TextOverflow.Ellipsis,
             maxLines = 1,
-            text = stringResource(
-                Res.string.chat__characteristic_change,
-                message.character,
-                message.value,
-                message.characteristic,
-            ),
+            text = stringResource(message.label, message.character, message.value),
         )
     }
 }
\ No newline at end of file
diff --git a/server/src/main/kotlin/com/pixelized/server/lwa/server/Engine.kt b/server/src/main/kotlin/com/pixelized/server/lwa/server/Engine.kt
index 9bda4df..288ab43 100644
--- a/server/src/main/kotlin/com/pixelized/server/lwa/server/Engine.kt
+++ b/server/src/main/kotlin/com/pixelized/server/lwa/server/Engine.kt
@@ -37,7 +37,7 @@ class Engine(
                     is CampaignMessage.UpdateCharacteristic -> campaignService.updateCharacteristic(
                         characterInstanceId = instanceId,
                         characteristic = campaignJsonFactory.convertFromJson(json = message.characteristic),
-                        value = message.value,
+                        value = message.newValue,
                     )
 
                     is CampaignMessage.UpdateDiminished -> campaignService.updateDiminished(
diff --git a/shared/src/commonMain/kotlin/com/pixelized/shared/lwa/protocol/websocket/CampaignMessage.kt b/shared/src/commonMain/kotlin/com/pixelized/shared/lwa/protocol/websocket/CampaignMessage.kt
index f651f15..3648abe 100644
--- a/shared/src/commonMain/kotlin/com/pixelized/shared/lwa/protocol/websocket/CampaignMessage.kt
+++ b/shared/src/commonMain/kotlin/com/pixelized/shared/lwa/protocol/websocket/CampaignMessage.kt
@@ -16,7 +16,8 @@ sealed interface CampaignMessage : SocketMessage, CharacterInstanceIdMessage {
         override val characterSheetId: String,
         override val instanceId: Int,
         val characteristic: CampaignJsonV1.CharacterInstanceJsonV1.CharacteristicV1,
-        val value: Int,
+        val oldValue: Int,
+        val newValue: Int,
     ) : CampaignMessage
 
     @Serializable