Note: I've watched all 4 seasons of Mu Wang Zhi Wang before writing this review, also this review will contain spoilers for Season 1, as Season 2 continues almost the exact instance where Season 1 ended.
This season is a direct sequel to the previous one, like previously stated; I suggest watching season 1 before watching this one if you haven't already since most of the characters that this season centers around are all introduced in season 1. This time, the two groups (raiders and guards) are targeting an ancient tomb in the mountains. As it turns out, the tomb clear medallion is a key to opening this tomb. In this season, the third party hinted at in the first season also makes an appearance (the imperial family). Because of the involvement of the imperial family now, we see an even greater emphasis on politics (as the imperial family can be split into at least two factions, each with their own goals).
Overall, a decent and enjoyable watch. Nothing ground breaking however.