Shiver's eyes narrowed, this was kind of limiting her options but still she was a mage so using the powers that her dark god had gifted to her she took a stance right outside of the chamber before starting to chant. The chant in itself was used to levitate anything metallic, including the chain and draw it towards her, now if the thing inside of the pool was metallic that would be a handy added bonus. And she'd ring the bell, summoning whatever was behind the doorway and doing it so that she was far enough away not to get smashed into a wall.