Heroes Charge: Outland Portal Lord of Caves how to kill ? Difficulty 1

To kill Lord of Caves in Outland Portal, we need a magic team. I used team: Commando lv 62, War Chief lv 62, Old Curse lv 62, Soulhunter lv 54 (Important), and Death Mage lv 55. I waited for the bug to dig a hole 3rd times when all my heroes had full energy, then use all util skills from Commando, War Chief, Death Mage and used Soulhunter util skill last. the reason to use Soulhunter skill last because that skill get the most damage based on the missing HP of the target. \r
Dont use old curse Util skill because it does not cause damage to target. If my heroes all lv 62 then I think it will be easier for me to kill the boss however I need to keep them low level for my guild members to use.\r
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If you have an better idea, please share a comment so I can test it. Thank you.