I just lost a Guild Wars match because the Frozen Soul 3rd trait on Bone Dragon would freeze me on skull hits to it but Bone Dragon would Incur NO DAMAGE! I must have hit it with skulls over 10 times and not once did it take 1 point of damage. And, no, it did not have barrier.
Probably an obscure bug but a bug nonetheless. Pisses me off like a lot of the other stupid bugs I run into.