Warlord's Bloodlust Needs a Rework

Warlord's Bloodlust is a strong Keystone, it's hard to deny that. It's VERY strong. That's the problem with its current state, though; it's too strong and there's not much reason to pick Fervor for Battle instead on most champions.

I think it needs a rework to bring it more in line with Fervor rather than trying to bring Fervor in line with it.

My proposed rework: Warlord's Bloodlust With each attack, the user becomes more bloodthirsty, seeming to heal their own wounds with their enemies'. Each auto-attack against an enemy Champion adds a stack of Warlord's Bloodlust, up to 10. For each stack, the user gains [0.5]% - [1.5]% (1 - 16) Lifesteal, up to [5]% - [15]% (1 - 16) with 10 stacks. Stacks last 6 seconds, and melee attacks generate 2 stacks. (Numbers can be adjusted for balance, but this is what I thought would be balanced.)

This is basically Fervor of Battle with Lifesteal instead of bonus AD, but I feel like it's a necessary change. Fervor and Warlord's fill the same slot: Buff autoattackers in sustained long-duration fights. This change would promote choosing between higher damage or higher sustain.

Edit:

• Minor fix in the main post. 10 stacks of Lifesteal should have read [5%] - [15%], not [5%] - [1.5%].