Electra

Electra is the final boss of the Entrance floor of The Catacombs. Electra can drop Electra Fragments, Unrefined Blade (Common), and Portable Conduit. The boss has 1 phase and can be killed by constant spam and maybe potions if you are lucky enough. It likes to camp under the water and also has Protector Guardians which drop nothing but defend Electra. You can also be pulled down into the water with the bubble columns. This can damage you or interrupt the killing of the boss.