The Umenzi are victorious if they destroy all defenders before 3000 points of information escapes, or if they get the High Priests inside the Library gates before 3000 points escapes. The defenders win if they prevent these conditions from happening. Marginal Victory conditions: determine how many points of information have escaped and compare it to the remaining Umenzi attackers. If the Umenzi have more unit points than points that escaped, they have a marginal victory. If more library points have escaped than remain for Umenzi army, the High Priests have suffered a marginal defeat (the gods will only tolerate the sacrifice of good troops if it achieves the objective).
I think it would be better to say:
Umenzi Decisive: High Priests inside Library before 2000 pts escapes
Umenzi Marginal: High Priests inside Library before 3000 pts escapes
Defender Marginal: 3000 pts escapes
Defender Decisive: All High Priests are destroyed
I'm not sure about the balance here, as the defenders could conceivably just whack the High Priests to win decisively. Thoughts?