Well Nehekhara is taken, so I looked for other nations that seemed interesting, and yes Seraphim need some repair on mages, reduced magic paths, and a bit more expensive troops IMO.
Stigia is too overpowered, they have immortal sacreds and really overpowered summons, not to mention free spawn.
I probably wouldn't allow those two nations myself, so I'm good with Commonwealth if it's ok with everyone else, and given they only have water for magic paths it probably is.
