The abyssal arm is a prosthetic (unbreakable) left arm, it connects at the shoulder but in return you get the following affects.

Magical blessing: the prosthetic arm grants 3 abilities, they are as follows.

• Pull: you can telekinetically pull a small or medium sized object/creature towards you as long as it doesn't exceed 200 pounds. Requires concentration.
• Push: you can telekinetically push a small or medium sized object/creature away from you as long as it doesn't exceed 200 pounds. Requires concentration.
• Passive enhancement: you get a +1 to dexterity and constitution, and a +2 to acrobatics.

Notes: "A arm forged from the deepest parts of the astral plain, fit for only a devoted warlock of the darkest patron.", Utility, enchantment