[Sombre]

You can't do it with a tag on a single unit. You'd do it like this.

#newmonster 1
#name "Turn 0 shape"
#firstshape 2
#end

#newmonster 2
#name "Turn 1 Shape"
#firstshape 3
#end

#newmonster 3
#name "Turn 2 Shape"
#firstshape 4
#end

etc etc etc

#newmonster 25
#name "Year 2 Shape"
#end

That way you get a transformation that theoretically takes 2 years of game time before you reach that final shape. So you can have gradual growth, or something that goes BAM shapechange after x turns.

HOWEVER - firstshape is also triggered by combat ending, not just turn ends. So any combat will accelerate the movement through the 'shapes'. See the wendigo in llama's endgame summon for a way to thematically explain that (he eats corpses after combat to grow).

Or you could just make a unit that can't get in combat, such as a unit which will kill itself with a #onebattlespell, like an immobile egg or something, which you are supposed to leave sitting in a fort until it hatches.

Everyone got it now?
#end