Chimera is Brute and Fire3.
So you could slot some Goblin Cards into a weapon/spear (Goblin: +20% to Brutes). As well as Vadon Cards (+20% to Fire monsters), or you could just go with an Ice Spear type weapon and pierce him to death, since he's large, you'll do 3 hits at a time.
Orc Warrior Card will reduce his damage done to you, but I'd suggest to get some basic HP cards, like Peco Peco. Cheap and useful!
As a lvl 93 Knight, he should be no big deal for you
