It depends a lot on what skills your character has. If you drag mobs one by one from chest AI +RC are best.
If leaving beetle near chest to fight in pile of guardians , then Poison + Aura of Nausea +FWW . Beetle should be on "Guard me" don't use "All kill". Having 50-70 real Music and Peace (with jewels , arms , talisman and even fishing pole or singing axe raise both to 100) spamming area Peace every 8 seconds will improve beetle even more . Sometimes it will be able to survive hoard map.