I beat this on normal the other day, the biggest tip is to understand how the tendril slash works, it's a line AE, and it will generally target the closest person. The easiest way to deal with it is run in first, and flag your heroes so they're not behind you but on the side, and they won't get hit at all. Alternatively, if you can, solo them. The AE has a travel time too so if you mess up make sure to move right away, and don't try to run away but on the side(it has a super long range). Kill one then run away asap and keep running until you drop aggro from the mobs that spawn. Fall Back! and similar abilities are extremely useful for this. Then pull them, kill them, clear the normal tendrils, and get another tendril. It's very slow but you just need to be careful about it.
I play a melee and what I did was just run in to get initial aggro, tendril casts tendril slash on me, I flag my heroes a bit on my side in range, make them drop spirits while I strafe to avoid the slash(I didn't even bother meleeing it), then flag heroes out and let the spirits kill the tendril while I keep strafing to avoid slash until it dies, then run out. My first stygian I died on the last tendril, that was quite enraging ^^.
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