I've failed it twise now for one simple reason: Seduce arms
Here's how I do it (tell me if I do something wrong):
A) I kill the tail and legs sitting at the middle of HT at the bottom.
B) After tail and legs my plan is to kill everything except the left arm that I would leave there when I afk that 30 mins to get drops.
The problem is that Beyond Blade hits the arms too. The arm(s) then cast seduce and my character walks into the rocks that deal hard dmg and I die.
It's extremely extremely frustrating... I could kill HT in few minutes, but I feel helpless against the seduce.