Harmony - Troop Symmetry

Regarding the Summoning magic: Many underestimate this school and rarely use it in the game, opting for dark, light, or chaos magic instead. Just as combat machines don't prioritize skills, choosing attack and defense instead of machines when possible, players also ignore summoning magic and choose dark, light, or chaos magic instead. But what if we encourage players to use these skills in the game? This could lead to a balanced use of skills and schools. Is it possible to make it so that 2 alternative specializations are obtained with the participation of summoning magic or machines?