Be careful what you wish for...

[The Elf-warrior]

I wish a army of trolls fought alongside the rohirrim at helm's deep.

Your wish is granted. Unfortunately the trolls got hungry and ate most of the Rohirrim (And Legolas.) But Minas Tirith was saved by the Ents and Huorns. But Eomer was killed after only six months as King fighting the Trolls in the caverns of Helm's Deep. Thus Faramir became King of the Rohirrim.

I wish Bakshi had done Pt. 2 of Lord of the Rings.