Just killed it last night, cleared the 4 fierce wyverns one time the named pop. Pulled it and got an add. Died in first attempt. In second attempt, I made sure cleared all mobs around and pulled it alone. That was a close fight. I am a 100 Paladin with a rogue merc. The fight was a straight forward but the snake has quite a lot HP and hit hard. It lasted for 5 mins i think and I used all my healing AA/ disc etc and with 20% mana left when the snake died. Sadly it dropped the bones and I was camping the weapon for my lv 90 SK.
This may be the easiest named in Beasts Domain. Had 105 DRU w/WAR merc and 100 silver Chanter w/CLR merc.
Deathsquirm had Life Squeeze on the WAR the whole fight. It capped the WAR merc's health at 70%. But, strangely, it was stuck at 70% for most of the fight. Her health just didn't drop under 70%. I think the CLR merc maybe healed her three times in the whole fight. It was a bit odd.
Dropped Bleached Bones, Greater Alaran Cantrip, and Embellished Armwraps of Kolos.