Nightmares of the Last War
Your arm is built of artificial materials, allowing you to make a slam attack.
Description Mighty arms are built of wood and metal, and sheathed in armour plating, like those of a warforged. Mighty arms can be fitted with warforged components, such as battlefists, that attach to the hand or arm.
Effect You gain a natural weapon slam attack that deals damage as a construct of your size (1d4 for a medium creature). You can make a slam attack while wielding a weapon in the other hand, in which case it is treated as a secondary attack (-5 penalty on the attack roll).