Summoners are a type of monster in adom. In addition to their normal attacks and skills, they have the ability to magically call upon assistance. Different summoners can summon different types and numbers of monsters. Some summoners are capable of summoning more summoners and quickly get out of hand.
Summoners will get exhausted by summoning and stop for a while but they will recover and resume summoning. If you or a pet of yours fight them, they will find less time to continue summoning, but the only way to stop summoners for good is killing them.