Upper_Krust
Legend
Hi guys! 
Its possible that the Pit Fiend has to trade some of its hit points for summoning, since the summoned creatures are indirectly part of its stat block.
I'm not sure what that trade might be, although if we change the Soldier 8 to 5.5 then it works out okay.
So 2 War Devils could be akin to 2.5 hp, or 1.25 hp per standard level each.
Or perhaps its level based/xp based. Something like take the square root of the summoned monsters XP value and reduced the Summoner's hit points by that?
486 - 126 = 360. Nope, that can't be it either.

Its possible that the Pit Fiend has to trade some of its hit points for summoning, since the summoned creatures are indirectly part of its stat block.
I'm not sure what that trade might be, although if we change the Soldier 8 to 5.5 then it works out okay.
So 2 War Devils could be akin to 2.5 hp, or 1.25 hp per standard level each.
Or perhaps its level based/xp based. Something like take the square root of the summoned monsters XP value and reduced the Summoner's hit points by that?
486 - 126 = 360. Nope, that can't be it either.