Warden from Halo 5. Even though the guy can already kill you with any attack on legendary 343 had to add smaller enemies to back him up. His boss fights are shit due to that and due to the area with him being too damn small. For his first fight there is hardly any cover at all for you. Then for the fight where you fight three of him I shouldn't have to skip the fight just to beat it. 343 went full retard when they did those boss fights.
Warden on legendary was no worse than on Heroic
First fight you can go on the platforms and snipe him with the inceneration canon while he's dealing with Osiris
Second time its almost too easy to keep your distance. Just stay on the rocks above and hide when he throws projectiles. He wont even come near you
Third one shouldn't be too bad unless he pushes the arbiter off the edge
The Dual wardens you can actualy cheeze him by taking the tank to him
The triple warden? Don't even do that gay bullshit. Skip his ass