It's not Skyrim, but it's still getting brought back a bunch! Borderlands 1, the first in the (in)famous trilogy. The one that started it all...
Battleborn is a 5v5 MOBA by Gearbox Software, with a singleplayer campaign and a variety of multiplayer game modes. There is an online ranking system along with a skill tree.
The classic that everything looter-shooter gets compared to. Borderlands 2 takes everything from the first game and quadruples it, if not more.
From the Steam page:
Borderlands 3 is an action role-playing first-person shooter video game, the fourth game in the Borderlands franchise from Gearbox Software.