Hei Jin (Monster)

Hei Jin has a move called scales of obsidian or something of the sort and it does nothing to me as an opponent. I only have Nul Fire and Nul Ice. Obsidian sounds like a buff or a dark/gravity skill... Hope its programmed correctly. My immunities are:
Def dwn
Sleep
Burn
Confuse
Fear
Md dwn
Mini
Zombie

Disregard....he used it again after i used a pheonix pin on him and it was a buff.

It should give him Wall (Protect + Shell). I wonder why it didn't work the first time. ��