Yeah this thing bugs me.. no clue what is the damage based off. I thought I know but not !
If it was max hp of champion/boss would it mean the hp number of 6star max lvl one ?
That would make sense but no.. I used to hit 75k from burn. now same champion (no change at all) is doing 80k and that would indicate easy clan boss having only 2.4mil hp
Poison always does 10k 2.5% and 20k 5% andd that makes no sense at all as it would indicate easy clan boss has only 400k hp.
Note that the difference between those 2 debuffs is poison is reduced by boss defence and hp burn is 3% reduced to fix amount. Those percentages would nuke boss in few rounds if You would build whole poison/hpburn team with all poison gear.