Unique strand map lvl 72 whakawairua tuahu

Killed her pretty regularly with a stand still scorching ray CoCh firestorm build. The easiest trick I've found is frostwall. On that character I had a CoDt setup. On my most recent melee character I switched in a spell totem frostwall and that did the trick. I tried bear trap but I can't seem to have her step on it ever.

Traps, Totems, or just melee with good movement speed to hit the thing in the face with single-target. Preferably with Stun.

The Shade at the start is the actual boss. Super hard for a level 72.
The sea witch is a troll boss.