Purple end mushroom

I bring you an idea that makes me excited and would bring a new mechanic to the game.
The purple mushroom is a variant of the common overworld mushrooms, this is generated only in the end, it would be something that you would get at the end of your game and it would not be something very common, it could be just as rare as the mushroom biome, but then clear, at the end, some islands with dark purple mycelium and the already named mushrooms.
What would you bring to the game?
Well, my idea is that this mushroom can be used to have a new position effect that would speed up more strength but ... When consuming it it would have a negative effect, which would be to deal much more damage than usual, it would increase the damage suffered by mobs and players.
If you wanted to have the effect of force plus speed stronger than the positions that already exist, that is, that the maximum would be force 2 or speed 2 if not ... reach a level of 3 or 4 both effects with the new effect negative that would make you suffer much more damage than usual because it is something that is balanced, what do you think?