Lifestealing

Lifestealing runs at lifestealing.com and it does what the name says, kill someone and you take their hearts, lose them all and you're out. You can check the site for the current details before jumping in, but the core idea is simple and it hits different once you've got two hearts left and someone's chasing you across the map. It's the kind of server where every fight actually matters instead of just being background noise.