Player and monster attacks follow the dungeon slayer rules

src/artifacts.rs

@@ -72,7 +72,7 @@ impl Artifact for Potion {
         // only consume potion of the player can gain at least one health point
         if !player.is_healthy() {
             let old = player.get_life();
-            player.change_life(self.health.try_into().unwrap());
+            player.increase_life(self.health.try_into().unwrap());
             let new = player.get_life();
             messages.insert(0, format!("picked up potion and gained {} hp.", new - old).to_string());
             self.health = 0;