Tentacle Slam has a 100% chance to activate an effect from one of your Idols.
Idol of Y'Shaarj
Summons a Shadowfiend.
Idol of N'Zoth
Your target witnesses a nightmare or vision of N'Zoth.
Idol of Yogg-Saron
Summons a Thing From Beyond.
Idol of C'Thun
Summons a Void Tendril or Void Lasher.
Shadow
Huntmaster's Call