Primal Bloodlust (3.5e Maneuver)

''Your teeth sharpen as you grow hungry and feral. They look less like people and more like walking meals now...''

You gain the scent ability, which is improved to detect creatures which are wounded and bleeding up to 3000 feet away. Up close, bleeding creatures smell so strong you can detect them in 30 feet as if using blindsense. This is in addition to the usual properties of scent.

You also gain a bite attack which deals 1d8 + strength modifier in damage for medium creatures (or 1-1/2 strength if it is the only attack you make in the round). If you already possess a bite attack, the damage is improved by one step.

Whenever you successfully kill creatures, their deaths empower you with greater lust for destruction. Every time you kill a creature you gain a bonus to attack rolls equal to 1/4 its CR (round down). That means the lowest CR creature that can provide a benefit is CR 4. The bonus lasts for 1 minute, and bonuses overlap, they do not stack.

Finally, you can choose to devour a helpless or dead fleshy creature for sustenance. You gain 1 hp for every HD the creature possessed. Eating a creature your size takes 1 minute, while eating creatures larger or smaller than you takes twice as much or half as much time respectively. For example a medium creature eating a tiny creature takes 3 rounds. You do not need to cook your meal, your stomach is tough enough to devour raw and rotting flesh.