I'd never heard of this genre referred to as 'LitRPG', but Awaken Online: Catharsis is a fantastic trip into MMORPG land!
Things are always clear in a MMORPG, right? Kill the bats and rats to get a bigger sword, so you can kill bigger rats and bats and get an even better weapon! Up until now moral choices have been simple, good or bad? Welcome to Awaken Online, where moral ambiguity seems to be the thing! Join Jason (great name) as he tries to figure out if the ends really do justify the means, and that maybe, just maybe, he's the bad guy here.
I really enjoyed this first novel by Travis Bagwell. It is free via Kindle Unlimited.
Awaken Online: Catharsis by Travis Bagwell via Amazon