Unique, probably summon. Pretender makes no sense - he serves Sauron. Pretender gods serve no one but themselves.
(Sauron would be the pretender - although arguably you can 'construct' a sauron with the current system. Although better graphics and tailored magic paths/abilities would be cool. Sauron at the time of Angmar is effectively 'imprisoned' in dom3 terms).
And pretenders make plenty of sense in middle earth terms. Its just by the time of the War of the Rings the Valar were not involved directly in the affairs of the world. One could argue the Istari are sort of like pretenders... Hmmm...
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