The first cultist falls to the blows, struck first by Rosa's claws and teeth, then by arrows from Lann and one of the other mongrelmen. The combined attacks are enough to put her down. As soon as she falls, Irabeth rushes through the open doorway to the next room to face the cultist there. He knocks on the door thrice, deliberately, before bringing up his scythe in a desperate block, but it's not enough.
"I won't forgive your ilk for desecrating our city. Our temples and places of faith" she tells the cultist.
"We don't need forgiveness from Inheritor's lapdog!" he grunts, staggering on his feet before Irabeth can get another blow. "We'll meet again soon enough..." he breathes, clutching his unholy symbol and unleashing a wave of fell energy, consuming his own life as he does.
Spoiler: OOC
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(1d6)[1] Channel negative energy, Will half.
Luna has actions before this cleric, and can try to put him down.