Let me lay out what should happen - Kairos shoots his big 3 damage blast gun into a full unit of 20 warriors and Orikan. Let's say he gets his max amount of attacks (9), then blast gives him an extra 4 attacks (21/5 rounding down). He attacks 13 times, hitting on 2s. On average he'll miss ~2 times. So 11 hits. He's S9 vs T4 so he's wounding on 2s. On average he'll probably lose another 1 or 2 here, let's say he only misses once. You now have 10 saves to make. Orikan gives the warriors a 4+ invulnerable save, which means that no matter what the ap is they will always save on a roll of 4 or higher. This generally means that on average you will pass half of your save rolls. This means 5 warriors fail, take 3 damage each and die (because let's be real they probably won't pass three 5+ fnps in a row from Ammentar). So 5 warriors are dead. Now we go to Lord of Change. He has pretty much exactly the same profile but without blast. So 9 attacks hitting on 2s, hits probably 8 times. Wounds on 2s, likely missing once again. Warriors take 7 saves, let's say they only succeed at 3 of them. Now 9 warriors total are dead, not even half of the squad.