Ok, so I have an idea, and that idea is…
This is part of the vampire evo tree,
Basically, you gain a new passive ability, bloodlust.
Whenever you hit an enemy, your bloodlust level increases by 1, granting you a damage buff of +0.1, with a max of up to 0.5 boosted damage. However, when you are hit with a melee attack, your bloodlust resets. Your bloodlust level also resets when you do not attack anyone for 5 seconds.
Ability is similar to knight, except it boosts this passive ability so that it only removes 1 bloodlust level when you get hit, and it buffs damage up to +1.0.
It’s an extra buff reward for being #1, I feel like it’s not a hyper strong buff either, just an extra incentive. I feel like another thing that would be good to do is add a icon on map which constantly reveals the #1 player’s location.