Kill a boss Spirit Summon only

This square requires killing a boss while your only source of damage is a spirit summon called by the Spirit Calling Bell. Some of the best options are the Rotten Stray Dog and the Soldiers of Godrick summons.

You are allowed to heal or buff your summons using spells, but you cannot deal any damage or perform any action that engages the boss directly to cause damage. Parries are not allowed, but blocking is permitted.