This is essentially two challenges, though one is much easier than the other. First off, take a look at the following creature.
War Troll of legend/ Monk 3, Cr: 17
Hit Dice 12d8+3d8 + 210 ( 277 hp)
Initiative +13
Speed 50
AC: 47 (-1 size, +19 natural armor, +8 dex, +6 wisdom, +3 armor, +2...