The summoner is a slippery flying enemy that can be really difficult to kill. As the name implies, he can summon other demons. The summoner floats around the room and prefers to keep away from the player, letting it’s summoned demons do the dirty work.
Killing the summoner can be tricky because it spawns with a shield that can take a few hits (a weaker version of the armored-pinky shield). If the shield is destroyed and the summoner starts taking damage, it will teleport away from the player and regenerate its shield. For this reason using splash damage is most effective against summoners.
Rockets are almost mandatory
Summoners can also attack by throwing a slow traveling energy wave at the player. This attack can go through walls and is very wide, but is kind of slow. Summoners have a really slow fire rate, so they aren’t very dangerous without their minions.
And of course the sommoner can summon lesser demons. There is a chance the it summons a hellraiser or a smaller chance it summons a new imp or a pinky. Right now those are the only 3 demons that can be summoned. I might add revenants or heavy weapons dudes to the list later, but I haven’t tested them with so much summoning variety yet. Don’t worry they have a limit to how many enemies can be summoned at a time (right now its 3).
You can actually bypass the shield with clever angling
Even without their shield summoners are very tough and hard to catch. These enemies should be your first priority on any battle! Kill them before they fill the room with enemies! (A couple of unmaker shots are the best option)