In regards to DnD I would have loved this aura to lose some toughness per damage taken to be more in line with the actual spell in the game (and to give it a chance in draft/sealed to be removed by swinging into it rather than having to wait for someone to remove the actual aura or creature)
Aegis Turtle
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Thanks to the read ahead mechanic, this can (at worst) do any one of these immediately upon entry
Perhaps it's a way to represent levelled-up magic, like the Thunder-Thundara-Thundaga progression that black mages use
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