Crystal PvP needs controlled state​

Crystal combat changes blocks, spawns entities and consumes inventory rapidly. A reliable server must define arena boundaries, refill rules, respawn behavior, cleanup and allowed items. Practice environments also need repeatable kit layouts and fair queue transitions.

Separate world and match concerns​

A world generator shapes terrain; a Practice core owns players and matches; a queue controls entry; a configured setup integrates those pieces. Select only the layers you need and confirm who restores modified blocks after each fight.

Test the failure paths​

Validate double deaths, disconnects, totem use, explosions, blocked placements, chunk boundaries, arena resets and restart recovery. Profile entity and packet workload with realistic combat before publishing player limits.