Velka is not overly concerned about the large number of zombies. He moves as far up the stairs as he can before using channel energy to do 2d6 damage to each undead in a 30 ft radius of himSpoiler(2d6)[11] then I will use a hero point to use it again. (2d6)[8] Edit to add: the zombies get a will save to half the damage save: 12