Unstable Stygian Paths

[NTJedi]

greetings everyone,

I tested stygian paths(death spell) on a game where I was easily winning. I'm not sure if the spell is broken or if I stumbled onto a rare bug, but the spell worked but said that 9.3 million units died during the travel to an enemy province also my pretender caster was dropped to 1 hitpoint. It appears most of my hundred-plus units arrived but I'm quite sure that if I combined all the units and enemy units for every game it doesn't even come close to 9.3 million... has anyone else seen problems with this spell especially with large armies??