1:
So i was thinking about what about a class/proficiency mod like lets say you now get a new start you pick warrior/ranger/mage you also get a basic loadout when you spawn at the camp after selecting a base class and based on what you picked you have passive ability and a active one, like you get a bar on your screen that fills in some way like lets say the more you kill or the more arrows you land on target or magic or something like that then you can use a key to unleash that attack like lets say for a ranger it could be to shoot 3 tracking arrows or for the warrior to go into a rage mode increasing your dmg and attack speed you know?

About the proficiency you can use every weapon in the game regardless of your class but lets say as a warrior you start using swords, shields and magic when you get to a set proficency with those items you now get the option to become a paladin giving you an exstra or new passive and a new "ultimate or a new attack" with what you had before or it replaces the old one.

I think that would be cool like lets say as ranger you re-gen arrows over time or if you kill with one perfect shot on set amout of targets you get a set amount gold or something change the magic system for the mages into a mana bar that they regen and so on thats one idea i have.

2:
I called it a "speed" mod and what i thought about was larger rooms that are more vertical and that you can now jump with space bar, then increase the aggression and speed of the mobs and give weapons and tools that support this new speed and verticality.

I just thought of unreal tournament when i came up with this like rocket jumping and such so that's basically that.

3:
Bosses like in zelda or something with mechanics and such i mean i cant be the only one who think of boss rooms and mini bosses right?

Feel free to put your input, questions or anything to these things i brought up and thought of :D