Prismatic Shield

Shield-sized shards of multicolored light manifest in the air around you, each rotating quickly to intercept attacks. Melee attacks against you impact a randomly colored shard, subjecting the attacker to a random effect from Prismatic Spray, with a saving throw of the type indicated in that spell. The shards automatically block physical ranged attacks the size of a spear or smaller, such as arrows, bolts, and javelins. You gain a +2 circumstance bonus to your AC against attacks with larger ranged weapons. Any spell that targets you requires the caster to succeed at a counteract check against your spell DC, or it fails to affect you.