Heliana's Guide to Monster Hunting, pg. 512
4th ring Wyrd, Transmutation
One of your arms elongates into a long, wet, suckered tentacle. When you cast this spell, and as an action on each of your turns, you can make a melee spell attack against a creature within 30 feet of you. On a hit, the target takes 5d8 bludgeoning damage and it must make a Strength saving throw if it is Huge or smaller. On a failure, you can choose one of the following effects:
• The target is knocked prone.
• The target is shoved 5 feet in a direction of your choice.
• You disarm the target; you take one item the target is holding and return it to your person.
The tentacle also serves as an appendage that can be used like a grappling hook or rope (GM’s discretion).