Big rant ahead:
He can't turn into demons and angels. AFAIK Gruagachan can only do stuff aligned to magic. So no turning into the queen of winter or Archangel Michael for them. I am sure a demon could arrange for a Gruagach to turn into a demon, though. "For the trinket price of your immortal soul..."
Yep, the saga is supposed to be more down to earth. This is why the character will be built more around Curse and Bless than shapeshift. Still, he will have 2 or 3 shapeshift spells. Raven, wolf and cat, for starters. No shape of the ancestors, though, since that does not fit with the concept. Even if, having seen it in action repeatedly in our previous saga I consider it on par with a Reme spell to control a whole city in usefulness level, it does not fit, so no use.
The whole idea was derived from the question: "how to introduce a gruagach-like character in bravant?" The answer was to use a supernatural creature as a forebear. A famous oje in that area was pan Caudarax, a dragon of fire that can shapeshift, had his hoard around and cursed a city when that same hoard was sacked. So some the gruagach powers look like good matches for the powers of the dragon
Besides, I am a total loser for dragons and Gifted gruagachan myself :mrgreen: We had 3 of each in our previous saga but they were all NPCs
The Might problem
While I agree that a Might 40 bear is a possibility, I would be REALLY har dpressed as a SG to justify Might increases to that level "just because". You cannot just keep growing your Might mathematically, you need to justify it. AFAIK Gruagachan can only adopt forms of creatures that exist. A might 40 bear might exist, but has never been seen by anyone IMS. So the gruagach cannot turn to it.
However, Might dragons and giants are known to be around. I guess it would be possible to get their shape. You can already turn into a (might-less) +5 size giant with a level 15 spell (sun duration). Doing the same for a dragon should not be impossible.
The big thing is: could a might-less dragon exist at all? I could pass with a combined spell that turns you into a dragon (base 5 for flying creatures) and allows you to fly (base 4, so add +1 for complexity). Should be adding something for size, say +2.
Shape of the Fire Lord (GvSh30)
R: personal, D: Sun T: Individual
This spell turns the target into a mighty red dragon. The creature is size +5, can fly and breath fire at the cost of 1 fatigue level per firebreath. The xdragon has no Might score, but its tough skin and broad damage brackets ensure a certain level of protection if it enters combat. The firebreath does +10 damage at Voice range
(Base 5, +2 Sun, +1 fly, +1 firebreath, +2 size).