If you liked
Shin Shirayuki-hime Densetsu Prétear
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...then you might like
Tales of Zestiria the Cross
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Main character (Sorey for Tales of Zestiria the Cross and Himeno for Pretear) has some 'spirits' assisting them to save the world from extreme malevolence. To lend the powers, each seraphim (Tales of Zesteria the X) and/or knight [of element] (Pretear) has to be in spirit form and join with the main character (Himeno for Pretear and Sorey for Tales of Zestiria the Cross) to lend their powers. Both are good adventure animes, though Pretear is more of shoujo and has obvious romance element.