I’d have the ability of overwhelming toxicity
A poison cloud would fill the room over time that would enforce an alt+f4 at the 5 minute mark
I’d also have an extremely toxic finisher that would scramble the code at enrage timer forcing anyone killed to enter into a hardcore mode and their character would be deleted
The power of never ever attempting to face the heroes head-on and being meticulous with contingencies and escape plans to accomplish just that.
Bigger than I have tried and died, and I rather like not being dead.
I’d be one of those bosses you have to heal to win… Cause I’m a healer…
Incapacitating Ramble
Targets the character with the newest WoW account, forcing them to listen to how much better the game used to be when all we had was auto attacks, and we liked it! While “listening” player is unable to take any actions other than roll their eyes and look at their phone IRL. Lasts 45 minites, or until paramedics respond to my life alert bracelet.
Permanent Mind Control with no counters. Like a DPS check, you need to kill me before I MC everyone!
Can’t be taunted. Healing causes 200x threat. I have volley spells and melee really hard. I enrage in 4 minutes. I heal 5% for every player I kill. My warlock pets come in periodically to help, and my volleys summon infernals. Hope you brought enough people to wear me down.
I’d just freely give gear to whoever gives me food
I have Windfury totems dropped near me throughout the fight giving me a chance to absolutely decimate the tank if it procs.
Target those totems DPS or die!
A Random Mechanic Generator:
I pick one skill used by a past boss of every expansion (Dungeon and Raid). The skill has just one name, it doesn’t call out what skill will be used. The counter is only a counter to when the skill being chosen is Rolled for. This skill would by my Basic non- auto attack so every 10 secs or so with a 3 sec countdown. good luck using DBM to tell you what skill is being used
Randomly Respec a player:
I choose a player at random and respec them to 1 of the 3 available (2 for DHs) and they would be forced to stay in that spec for the rest of the fight. This skill would happen every 30 sec. (You can never be respec’d back to your original spec if selected multiple times or fail a safety dance) Be prepared to fill a role you’ve never done or prepared for. Coming to raid in a different spec as your ideal spec “could be good, but you might never be targeted”
Area mechanic:
Safety dance (mostly because I loved that fight) - And player that fails the dance takes damage and is automatically respec’d (You can never be respec’d back to your original spec)
I would be a slime boss with a comically huge amount of health that takes 50% reduced damage. Pools of goo constantly randomly spawn all around my room doing damage to players who touch them.
Every time a player takes damage from them I gain an absorb shield equal to 1% of my health, stacks up to 10 times.
Whenever the shield breaks it summons 10 slime adds that attach to the heads of players siphoning health from the player they are attached to. When they are killed all of the health they siphoned is transferred to me.
I am also the first boss and unskippable. Good luck nerds.
Mind control. The trolling potential is just too good to pass up.
My signature ability would be each player is assigned a node on a tangled thread
https://warcraft.blizzplanet.com/wp-content/uploads/2017/09/wow-7-3-lucid-nightmare-mount-00019.jpg
Omg this could be amazing. You only take damage when no lines cross. But there are ground effects. Incoming a 70 hour fight.
Mind Control players are immune to Damage! cause that would be better than the Jailer fight.
Id be the endgame boss you never directly fight. And i dont mean that in a Sargeras way, i mean it in a I never actually fight kinda way.
All of my -ahem- employees, would fight on my behalf and die for me.
The reward for beating me? The privilige of being one of my new employees. Its a great gig: 70 hours a week, .5 hours of pto a year (use it or lose it), competitive wages (1 silver an hour!), and a friendly environment!
Toxic fart that blinds everyone, projectile vomit that does a corrosive DoT, and a shout that silences hunters and warlocks for 600 in game days.
Every 45 seconds I snap half the raid is force logged off. That being said they do not exit the instance and can get back in.
I then become untauntable and start attacking random players prioritizing offline players.
The rest of the raid needs to work together to keep me from killing the offline players before the next snap sends another half out.
Eventually it will come down to 1 v 1, who ever is left will be buffed up to the power of a raid boss and would have to solo the fight. If they loose its a restart. If you win, the loot pinata pops.
Good luck and hope yall have good pcs.
How about a bad Torghast. As in you don’t get to select what anima you want, it’s given automatically and they are all negative effects.
The objective is just to survive a final run for the goal line
What about breaks and hazard pay 
.
What are those? Never heard of em.