@Satyam_SSJ10 As mentioned in other comments, "thou" is second person (like "you"), so it doesn't work in that context.
I did some digging, there's not really a formal first-person pronoun in English. If you really wanted to use an archaic word, "ich" or "ic" might work.
Alternatively, you could make the "you" formal instead. The raw did use the kanji 汝 (なんじ) for referring to Diablo, which seems to be at least semi-formal, so you could just use "thee" or "ye" instead of "you". Also, removing the conjunction and using "with" instead of "to" would make it more formal.
For example: "I would like to talk with thee/ye for a bit."
@Guspaz Interestingly, thou/thee are also commonly misused, as they are actually very informal (more formal speech would use the plural "ye" for individuals). However, since most people these days understand them as formal, using them like that would only offend middle English literary geeks.