Harmony - Troop Symmetry

Summoning – a must-have school for factions with high magic. This primarily applies to Necropolis. It also works well for Academy, though they don't have the necessary spells in their castle, which is a problem. In my opinion, this school is clearly stronger than Chaos, and compared to Haven, it's 50/50 (stronger when there's an opportunity to get high magic and high-level spells, otherwise weaker).
So, I don't think we need to "push" anyone in that direction.