Gravitational Field on Emperium (#9150)

- Gravitational Field will now always deal 400 damage on Emperium on all levels in pre-re
- Renewal is unaffected
- Fixes #9149

src/map/battle.cpp

@@ -9651,6 +9651,12 @@ struct Damage battle_calc_misc_attack(struct block_list *src,struct block_list *
 		case HW_GRAVITATION:
 			md.damage = 200 + 200 * skill_lv;
 			md.dmotion = 0; //No flinch animation
+			if (target->type == BL_MOB) {
+				mob_data& mob = *reinterpret_cast<mob_data*>(target);
+				// Deals 400 damage to Emperium on all levels
+				if (mob.mob_id == MOBID_EMPERIUM)
+					md.damage = 400;
+			}
 			break;
 		case PA_PRESSURE:
 			md.damage = 500 + 300 * skill_lv;