There was a really popular World of Warcraft server back in the days, where each side had it's respective races, horde orcs/undead etc & alliance, elves etc.
Was really popular & was RPG no TPs, whatever happened to it i'll never know but yea, they're popular if done correctly.
It had things like,
No Trainers
No TPs
Tier Gear, so if you were a Horde & you killed someone from alliance who were obviously on otherside of map, they dropped a soul stone, White soul stones from alliance & black from Horde.
Each town was locked out by the other race & fully PZ so no wars happeend in town, but an Orc could never enter an Alliance base.
Was nice :>