[DGDobrev]

Hmmm... Are you sure the damage is 1575? That's 300% over the basic lvl 2 Sacrifice 500 damage. 300% boost for 14 levels looks quite a lot. Destruction adds 50% at best, so you must have 250% from intellect and items. That means you either have over 22 intellect by lvl 14, or something is amiss - keeping in mind that you had the runes to afford lvl 3 destruction. I am aware that both of those are manageable by that level though.

As for the mistranslation, there isn't one. It is 50% increase.

Well, let me see the game mechanics of Sacrifice.

The basic formula is:

Number of creatures = Damage/Target HP => rounded down
Damage is astral - no resistance against it.
Damage = Damage*(1+0.05*Int)*(1+0.01*(Destruction+items))
Where the damage inside the formula is 500 - the basic lvl 2 sacrifice damage.

Maybe that rounding down plays a small problem here, or the damage you inflict isn't 1575. It looks quite high for me for lvl 2 sacrifice cast by a lvl 14 Mage. As far as I know, the only restriction concerning sacrifice is when the damage isn't enough to raise a unit, or that it can't be cast on magic immune creatures. It also looks like you're not killing the entire stack, as 36x70=2520.

However, if you sacrifice only 18 (meaning you split the stacks), that is less than 1575 - 18x70=1260 total, which is 1260/2=630 HP, which is not enough for a troll.