Коммент с Вовхеда нашел.
The following details reflect the Normal version (403 ilevel):
Your special weapons swings have a 2% chance to spawn a stationary tentacle on the ground.
The tentacle attacks with a mind flay, channeling for 3 seconds. The mind flay ticks every 1.5 seconds for a static value of 11155 damage.
Attacks on average 8 ticks per tentacle, causing 89,240 damage or 7,214 dps.
