Buy one with RP and it locks to you and your friends. Or take one of the three ambient raids running at all times — free, and anyone can turn up.
A raidable base is a fully built, defended base that spawns for you to break into. Pay RP and one appears, locked to you and your friends. The harder the tier, the tougher the defences and the better the loot inside.
Spend RP through /kit to spawn a prebuilt base in the PVP zone. If you can't place it, /s sells it back — but it has to be in your inventory, not your hotbar.
Flee damage is set to zero, danger zones are off, and monument crashing is disabled. It fights to destruction every time.