[Saint_Dude]

Conventional forces are not effective vs. Niefel giants.

However, Your rainbow pretender as well as the Oreiads and Astrologers should be effective with the with the right scripting.

Some spells to consider:

Conjuration: Phoenix Power (F2), Summon Earth Power (E2), Power of the Spheres (S1), Light of the Northern Star (S3), and Will o' the Wisp (F1)

Alteration: Curse of Stones (E3) and Destruction (E3), Swarm (N1)

Evocation: Magma Bolts (E1, F1), Falling Fires (F3), Magma Eruption (E3, F1), and Thunder Strike (A3)

Thaumaturgy: Rage (F2), Prison of Fire (F3), Paralyze (S2), Confusion (A1), Soul Slay (S3), Enslave Mind (S4), and Hydrophobia (F1)

A couple of cold resistant thugs would be very helpful, especially if equipped with Fire Brands.

Fire Snakes also work pretty well vs. Niefels.