Summon Mushrooms is a monster-only spell which summons several wandering mushrooms and deathcaps. Although the mushrooms are unlikely to be a major threat to endgame characters, their attacks can confuse you and deathcaps can cast drain life, dealing unavoidable negative energy damage and healing them in the process. Furthermore, they can get in the way of attacks against their summoner or attempts to escape.
The following enemies cast Summon Mushrooms:
Prior to 0.13, Summon Mushrooms only summoned wandering mushrooms.