normally summoning dragons costs 100 orbs.
for some it's 200 or 500, it's harder to summon them, summoning happy hour for example only allows to use 99 jokers.

my question: how many orbs do i get back if i recall such a dragon? i cant see that for myself in the game because i dont have two of any of those special dragons.

@apoli I don't have dupes of them but I am 75% sure you get the same amount as all other dragons. The increased amount in summoning is to ensure it is not too easy to get them.

so you think you'll lose the extra 100 resp. 400 orbs? that would be unfortunate. let's see when someone actually finds out.