Here's a rig I got to work on for Blubber Busters.

The rigs were pretty straightforward but I added a layer of procedural animation which could generate some basic pulsing and movement of the tentacles.

Go check out the development of the game by the awesome team at: http://www.blubberbustersgame.com/

Concepts by Avery Coleman
Models and textures by Maddy Kenyon and Cody Bunt
Animation by Paul Jarvis

You can view more of my work on Blubber Busters here:
https://www.artstation.com/artwork/ObbPw
https://www.artstation.com/artwork/8JY6x
https://www.artstation.com/artwork/NWaZz