[Monstrosity] 99 rewards

I've been enjoying leveling in monstrosity and I've also been thinking about how there is no reward really for obtaining level 99 on a monster. I came up with a couple ideas I think would be cool if one of them were the reward for getting a monster 99.

1. Unlock a unique skin that isn't in the game, only unique to monstrosity.
2. Unlock a 4th instinct that is a combination of the earlier 3, but maybe slightly lessened.
3. Be able to "learn" a weaponskill of the monster to use on any other monster.
4. Be able to gain merit points for monstrosity specifically
5. Unlock the normal size form of that monster (i.e. instead of being a smaller behemoth, would be the actual size of the behemoth players fight.)
6. Have vanity equipment for monsters and at 99 unlock a piece of vanity gear (i.e. crowns, bows, tattoos)
7. Highly unlikely, however if someone got 99 on each monster in a family they would unlock a special monster that isn't in the game and is unique to monstrosity.

I think some of these would be more likely than others, but I just hope SE decides to put at least some sort of reward for getting 99 on a monster. Let me know what you think. Thanks for your time!