A single tentacle grows from your body, usually your side or back. The tentacle might resemble an octopus's suckered tentacle or a simple, scaly pseudopod.
Benefit
The tentacle grants a +4 mutation bonus on grapple checks. It can also grasp and manipulate an object you can easily hold in one hand. The tentacle cannot be used to operate a piece of equipment that requires opposable digits or fine motor control.
You can "hang" from your tentacle indefinitely by wrapping it around a larger object, thereby freeing up your other limbs. The tentacle isn't dexterous enough to fire ranged weapons, but it can be used to make a natural slam attack. The tentacle's slam attack deals 1d6 bludgeoning damage (assuming you are Medium size) and has a 10-foot reach as if it were a reach weapon (although you can still use it to attack targets adjacent to you).