In a Minecraft lifesteal server, players can engage in PvP (player versus player) combat with each other, and when a player defeats another, they permanently gain an additional heart. This mechanic creates a unique and challenging aspect to the gameplay, where players must balance attacking their opponents while also protecting themselves from enemy attacks.

The server may also have a variety of features, such as custom maps, custom mobs, or unique game modes to enhance the player experience. In addition to the permanent health gain, players can earn rewards for successful attacks and kills, such as in-game currency, items, and special abilities.

Overall, a Minecraft lifesteal server provides an exciting and challenging experience for players who enjoy intense PvP combat, strategy, and a competitive environment.