v0.8.0: final tweaks and adjustments:

- it's no longer possible to trigger on-hit effects on invuln enemies
- rippers now have a 1 turn delay when summoned by demon spawners

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/Char.java

@@ -239,7 +239,17 @@ public abstract class Char extends Actor {
 		
 		boolean visibleFight = Dungeon.level.heroFOV[pos] || Dungeon.level.heroFOV[enemy.pos];
 
-		if (hit( this, enemy, false )) {
+		if (enemy.isInvulnerable(getClass())) {
+
+			if (visibleFight) {
+				enemy.sprite.showStatus( CharSprite.POSITIVE, Messages.get(this, "invulnerable") );
+
+				Sample.INSTANCE.play(Assets.SND_MISS);
+			}
+
+			return false;
+
+		} else if (hit( this, enemy, false )) {
 			
 			int dr = enemy.drRoll();
 			

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/buffs/Combo.java

@@ -74,8 +74,7 @@ public class Combo extends Buff implements ActionIndicator.Action {
 	
 	public void hit( Char enemy ) {
 
-		//doesn't increment combo count if enemy invulnerable
+		count++;
-		if (!enemy.isInvulnerable(target.getClass())) count++;
 		comboTime = 4f;
 		misses = 0;
 		BuffIndicator.refreshHero();
@@ -216,6 +215,13 @@ public class Combo extends Buff implements ActionIndicator.Action {
 				ActionIndicator.clearAction(Combo.this);
 				((Hero)target).spendAndNext(((Hero)target).attackDelay());
 				return;
+			} else if (enemy.isInvulnerable(target.getClass())){
+				enemy.sprite.showStatus( CharSprite.POSITIVE, Messages.get(Char.class, "invulnerable") );
+				Sample.INSTANCE.play(Assets.SND_MISS);
+				detach();
+				ActionIndicator.clearAction(Combo.this);
+				((Hero)target).spendAndNext(((Hero)target).attackDelay());
+				return;
 			}
 
 			int dmg = target.damageRoll();

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/DemonSpawner.java

@@ -105,7 +105,7 @@ public class DemonSpawner extends Mob {
 
 				Dungeon.level.occupyCell(spawn);
 
-				GameScene.add( spawn );
+				GameScene.add( spawn, 1 );
 				if (sprite.visible) {
 					Actor.addDelayed(new Pushing(spawn, pos, spawn.pos), -1);
 				}