[Nagot Gick Fel]

Originally posted by Boron:
are there any other such ubercreatures which can be only summoned per wish ?

The other Horrors (including the King of the World). Ashen Angels. Lammashtas. Ancient Presences. And a few others. None of these come close to the power of a Doom Horror though.

and in sunrays dominions lib i found the following information :
"(Pretender name)" : you get that pretender, with default magic and abilities (Daughter of the Land gets gems, Moloch gets imp, Ghost King gets ghosts, etc).

Actually you 'Wish' for an unit type, and pretenders aren't different from militia in that regard. Whatever you wish for, the unit will always appear with its default abilities and/or magic skills, although you have to use GoR on it to benefit from these. Bottom line: you can wish for as many 'Militia' or 'Prince of Death' or 'Green Knight' or 'Troll Raider' as you want - they're just unit types.