Kael 2 raid is very similar to the Kael group mission with some additional mechanics. One of them is a sacrifice mechanic. A banner shows up and the raid is asked to sacrifice one person by clicking on the banner. If no one clicks, I think I have seen between 3 and 5 random people killed in the raid instead. So that is the basics, however I have noticed some other things after clicking. First time I clicked it told me I was not worthy and weak for volunteering. 2nd time it rejected my sacrifice entirely killing 5 other people besides me. Is there a way to be viewed worthy? I wasn't called to bend the knee in the upper section - would that have made me worthy? Also, is there a way I could volunteer a 2nd time? Could two people alternate on clicking, or is it click only once for the duration of the raid?