So I have two ideas. One is a playstyle the other is a build.
The build is something I'm calling Pryomancer (Sorry if someone finds this build somewhere else I had no prior knowledge) it's completely fire centered. You can only use fire upgrades like flaming weapons in the Shadow Wars Act and Cleansing Flame. In sieges you can only use fire catapults and Drake's and if you complete the Carnan questline only use the Dragon Song ability. And if you intend on using loot boxes (No please don't crush me angry gamers) you can only use ones that give fire weapons and upgrades. I'm not restricting gear but another addition might be to only use weapons with fire upgrades.
The playstyle is something I'm calling Liberator. It's simple in concept, you can only brand slaves and captains (though preferably Captains that were slaves and killed you) and with the current version the Outlaws as well. Now you're a civil minded Talion with a mind towards freeing the slaves and helping the Outlaws become one with their compatriots once again.
Hope you guys have fun! Share any questions comments or concerns here and I will answer them ASAP