New Piece: Metamorph

This seems a good solution. The MM cannot protect the angel, but the angel can protect the MM. This means that in order to break the deadlock, black must give up a queen to remove the angel, and can then easily win the MM. 

This should be a win for white. The angels wall the king just enough while the king cuts off other squares. The thing is queens would intefere here with checks. 

The two angels situation is still problematic. Yes white can technically win, but not by force, and further, he can easily draw. Black will need two angels himself to ensure the queens can surround the white king without being captured, which is the only way to force zugzwang. 

If white promoted the extra angel, I guess you can say he has earned the draw, but it's still a massive material imbalance that white is able to defend against.

Sure white can win that example by force, but the ability for both angels to protect each other is irrelevant since the white king can protect them.

I think a angel's ability to leap 2 squares+knight manuveuring makes it a win even with the queens.

Not quite. Without an angel on h4, that square is physically accessible.

Actually, black is lost here anyway. Nevermind that.

I think if white get's 3 angels, they deserve a draw at that point.

And using theory black should know to make angels instead of queens. If they don't that would be like not knowing to promote to queen instead of bishop in classical. Their fault. 

In NEISG they added a rule that two Angels do not protect each other. Probably because they were facing the same dilemma with forced draws. It may be elegant to follow the example in Bulldog chess.

That had happened here.

ok cool

Did you already look at how the defense form impacts e.p. capture and castling? For the Angel I've concluded:

- The King can castle through attacked squares if the defensing Angel is protecting these squares.

- e.p. capture is not allowed, if the pawn that makes the capture ends on a protected square.

"Defense metamorphs cannot provide immunity to other pieces/forms which grant immunity. Examples are angles and other defense metamorphs."

You added this in the attack form section of the OP, you may want to change the OP.

I thought about this (regarding castling anyway) the other day while analysing my game vs Marks, and forgot to come here to mention it. This was the solution I was thinking of.

The rule clarification regarding defense form was placed in the offense form section. Also, angel is misspelled

I found something else in the OP:

"Adjacent kings can not be put in check or checkmate."

I'm pretty sure that you meant to say:

"An adjacent allied king can not be put in check or checkmate."

OK and then, if an attack form MM can take a Dwarf by itself, I suppose that doesn't mean that it can take the opponent's defense form MM by itself?

"The metamorph itself is immune from strange abilities from fairy pieces such as transparency."

I'm pretty sure that you meant to say this:

"The metamorph itself is immune from strange abilities from opponent's fairy pieces such as transparency."

No, I would have specifically said this if it were the case.