This spell has a few different effects. When it is cast, the player rolls a d8. The result can then be split among the caster's AC and his initiative. (i.e. if the result is a 3, the caster can improve his AC by 3, or improve AC by 2 and initiative by 1, or improve AC by 1 and initiative by 2, or improve initiative by 3.) Once the caster has chosen the split it can not be changed during the duration of the spell.
The material component of this spell is a feather from a eagle of any kind.