Metal Face was a bit of a challenge, but I personally feel Xord (the 1st major Faced Mechon) gave me the most trouble out of all the Faced Mechon (aside from maybe 1 or 2 others towards the end). I played as Riki the most due to his hilarious voice and design. What set do you use with him and Dunban? I recall going Lurgy, Freezinate, Burninate, Bitey Bitey, Say Sorry, the AoE healing, the Break...