Weapon from Flesh

You convert fresh corpses into weapons of the same damage die as their hit die (max d12). For example, you can form a glaive (d10 weapon die) from an Aboleth's corpse (d10 hit die).

You can instead choose to create a weapon of a lower weapon die and add a 1d4 of necrotic, radiant or force (depending on their alignment) of additional damage. For example, if you use this ability on an Aboleth (d10 hit die) and create a shortsword (1d6 weapon damage die) the weapon will deal an additional 1d4 necrotic damage (evil alignment). 

Weapons created in this way can be used with your spell casting modifier and count as arcane focuses. These weapons last for 1 hour or until you are incapacitated.