Prevents the appearance of the selected mod during the run.
Once unlocked, the "Unlocks" menu will have an " n/N Locked mods", where n is the current amount of manually locked mods and N is the number of the maximum amount of mods you can lock.
You can only block the mods from the bottom to the top of a mod tree, but you can lock one of the middle mods of a tree, this is to avoid locking a whole mod tree with only one point.
You get more Lock points with higher ranks
This can be helpful once more mod trees are included in the game, to avoid the build making convoluted.
Inspired by a similar system in the game "Dungeon Maker" where you can lock certain features of the game once you are far enough.