Act II - Grave Robber
It is now or never: time to break Eramis out of her cell. Use the Pocket EMP at Eramis's cell door to disable the barrier as well has her cuffs.
You've bartered for Spider's Pocket EMP device that may or may not have come from the Praxic Warlock vaults. Bring it to Eramis's cell and use it to disable the barrier door and Eramis's restraints.