Board Thread:Fun and Games/@comment-29604386-20180410193346/@comment-33560940-20180412133453

EgamIrorriM wrote: Arcane Nullifier 5000: Nullifies any spells cast while active. Effect lasts until it is brought down. MAGIC DETECTED. PREPARE TO DIE, PUNY MAGE. Can't counter me that way, can you?

BoP is right: those spells are called silence, they stop magic in a certain area, and only last for a limited time. Also, spells cast outside of the area can still go inside the silenced area and do stuff.