Well we only faced them once, but those tentacles can proc back to back and they dealt dmg every second.
And when it hits normally for 7k but crits for 12k I guess it's at about 8k dps during the time it's up.
My DK said he couldnt kill the tentacles.
So that's how we went out of the match.
mehh cant kill tentacles/totems with howling blast, halp me cant kill them