ok lets go with a boss fight. We can call the boss Lobozbane ( a hunter with a good amount of hp and dps). Lets make this a bounty / revenge questline. Loboz is an outcast, shunned by his peers, a lone wolf persay. He murdered the king of sw, alo ng with his family and has taken refuge in the keep. So now you have to infiltrate the keep and neutralize the threat which is Loboz and his band of marauders. So you go in the keep and keep to the standard, murder all of the lieutenants and footsoldiers. then you get to the sw throne room and you must fight each of Loboz' pets, all of them are spirit beasts, (arcturis, etc). Not gonna go into detail in their attacks and such that would take up alot of this. But once they all are defeated you and loboz exchange dialog. And he shoots you with a scatter shot that does an assload of damage AlSo it makes you wander for a bit. And he then rushes to the portal of darnassus (in typical loboz fashion might i add) and you go after him into an instanced darnassus where you have to complete quests to find out his location. One quest would be following footsteps to a tunnel in teldrassil, then you get ambushed by sw guards who try to arrest you for killing the king. But you explain that it wasnt you and the guards give you a quest to go rough up the local band of marauders and theives in the area. once you get to the last band of thieves , the leader who is a subboss with a good amount of hp and damage, says that loboz has tried to seek council with the warchief in borean tundra. So you have to venture to northrend in search of your archnemesis loboz. Then once you get there you are pulled aside behind some barrells or whatever and this girl who is a traitor gives you an item than transforms you into one of loboz mercenaries, and yo u have to infiltrate that place where garrosh and thrall are.
which is gonna be difficult because you have to keep reapplying the disguise once inside, ( every 10 seconds) and if you are seen without the disguise instant death. so you find loboz chatting with thrall and garrosh and then he leaves, and thrall notices your disguise, then you have to fight him and garrosh at the same time. Th ey spam warrior stuns on you. So after you beat them garrosh tells you where lobo is heading. Ironically its gurubashi arena , and there at the arena you fight his lobotomizers, who are ( shadow council priests ) a real pain in the ass to kill because they beserk early and if one beserks all beserk, so youll need a group. Then once you manage to kill them Loboz jumps down from the outer ring and starts fighting you, when you get him to a certain hp he feign deaths and if you get close to him you are poisoned ( assloads of Dots) , then he pops up and scatter shots you and stage 2 begins, all throughout the fight hes calling you names and such, belittling your mom to, after that he casts a spell that puts you to sleep and he calls on Qqmoar his right hand man , then you and him fight (qqmoar casts traps every few seconds that hurt you ALOT, the ice traps freeze you in place for 7 seconds and you are inflicted with brittle bones which halfs your damage and movement speed for 15 seconds) after you defeat qqmoar he dissappears in a smoke bomb and exclaims "i dont get paid enough for this". Then loboz hops back down in camoflauge and shoots at you (chimera shots, silencing shots, explosive shots) this stage is all about not dying, so heals are advised. THEN after about 5 or 10 minutes of healing and him shooting at your team and you, he comes out of camo and enrages and the real fight begins, stage 3, (Loboz' multishot can kill your entire team so be advised) . But once you kill him he drops some great ****ing loot, like black temple TBC good. thats my rough edit for this custom boss storyline. it can use some spit and polish before officially being added ( if you like the story). (Along the way in the instances you pick up items in the environment that once you turn them in you are given a gearset, "lone wanderer pauldrons and such")