I think the cleansing powders should be removed from the raid, like it only gives 5% shadow res and 99 def? Which ultimately I don't think most people need this. The only other use of the powder is to remove the debuff that we get from entering laurena.
The debuff when entering is something really inconvenient (decrease 7% hp per second, shadow res -30%, 40% of receiving crit hit, atk level -10) , aside from needing to have 1 seal each member, everyone also needs cleansing powders to remove that buff.
In my opinion, I think having seal to join laurena and kill her is enough, and cleansing powder should be something optional for those who would like to have extra 99 def.