[Mirac Honorguard]

I found the little annoy thing, only problem is, how am I gonna capture it.
It's my first found waterdhavian creature I found, I started off in prison as a gladiator (these exotic weapons rule, especially the two bladed staff) I found it, made the big protector of the big cheese surrender to me and now I beat the big cheese himself, intellect thingy comes out and start casting this crapload at me :S

Any clues on how to capture it? (I got a +1 two bladed staff, doesn't affect the little bugger)

Thanks in advance