Here is a great boss fight mode i created.
You will face a symetra controlled by A.I. which has unique paterns !
The dificulty will also raise when it life drops under specific levels.
While able to pick between mcree soldier, genji, hanzo, junkrate and ashe, you'll have to face it alone or with friends !
(indeed the difficulty will be updated according to the number of players).
The number of life is equal to the number of player :
When you die you'll revive but it will take 1 life
Once this number drop to 0, game over !
Have a great time !