I kind of agree with the analysis that armor from endurance is very useful. However, if we're discussing early game with 4-6 armor units, it's not essential as a starting spell.
Holy armor fares better early (which is a likely better starting spell than healing for AI ... especially considering how early game is dominated by multi-figure battles)
I still strongly encourage 'uncommon on research book' to include prayer. I don't know why it's left out over a plane shifting spell (nice, but essential?) and 'stream of life' (extremely expensive, AI may not have banks/merchant guilds yet). Prayer is the only spell the opponent might need this early in the game.
Holy armor fares better early (which is a likely better starting spell than healing for AI ... especially considering how early game is dominated by multi-figure battles)
I still strongly encourage 'uncommon on research book' to include prayer. I don't know why it's left out over a plane shifting spell (nice, but essential?) and 'stream of life' (extremely expensive, AI may not have banks/merchant guilds yet). Prayer is the only spell the opponent might need this early in the game.