Talk:Dead Heat Summer Race!/@comment-14.173.49.253-20170816133140/@comment-31096423-20170816144921

Go to that servant's profile and check their instant death rate, then you have to multiply it by the instant death rate the NP does. I'm not sure what the actual calculations are, but in theory, if a servant has a 5% death rate and you use a NP that has a 100% death rate, it should mean that the servant will have a total death rate of 5% (instadeath of the NP is 100%, totaling the actual chances that servant will die, which are 5%, if the NP had 50% death rate, it'd mean the servant would have 2,5% chances to instadie, if the NP had 300% chances to instakill, it'd mean the servant would have a 15% chance to instadie).

And checking the servant in question, Atalanta, her death rate is 31,5%, which means her chances to die to a 100% instakill NP are 31,5%, meaning that with a Gaebolg at 500% overcharge, you'd have 31,5% chances to instakill her, 18,9% with no overcharge. I believe King Hassan has a 200% kill rate with 500% overcharge, increasing the overall chances to kill her up to 63%.

After looking around, the calculation itself is done this way, from beastlair's forum: hitRate * deathRate * (1 - instantDeathResistUp + instantDeathResistDown). I'm not sure this is correct though, since if this is applied to Old Man's NP with overcharge + his death resistance down debuff, it'd mean against Atalante the chances of her to die would be 126%, meaning, she'd die, guaranteed, and that doesn't make a whole lot of sense... if it is right though, Hassan is way too overpowered, really, almost all servants have a death rate of around 25% after all. If we added certain other CEs...

Hassan of the Cursed Arm's CE gives 20% death rate up to all allies while on the field, Ryougi's CE adds an additional 30% up to the death rate of all allies too, Equipping the Hydra Dagger to Old Man would increase his own death rate by 10% (LB CE), addini it all, + old man's debuff, + Shiki's debuff:

(2 + (2 * 0,2) + (2 * 0,3) + (2 * 0,1)) * 0,315 * (1 - 0 + (1 + 1) = (2 + 0,4 + 0,6 + 0,2) * 0,315 * (1 - 0 + 2) = 3,2 * 0,315 * 3 = 3,024 = 302,4% chances to actually die, meaning, that's an absolute instant death...

If we applied this to BB, which has a 0,6% death rate, which is the lowest among all servants in the game (safe for Beast III/R, which is 0%), the actual chances to kill her would be... a whooping 5,76%!