The 'claim system' is used by majority of players to avoid loot stealing of any sorts. It's rather simple.
- Find a boss or any rare monster or anything you don't want stolen.
- While INSIDE THE COMBAT SITE (not the general location of it), say 'mine' or anything claiming in the LOCATION CHAT.
- Other players finding the same site will mostly avoid attacking it.
- Claims lasts for 20 minutes after they are made in chat.
- Previous claimers can reclaim the monster as long as they are putting effort on killing it, and not being afk for 20 minutes.
- If someone finds a boss that you put to 1 hp and didn't claim and takes the loot, not much can be done as it wasn't claimed.
- Other players can claim any unclaimed boss, damaged or not.
- If the claimer dies, the boss is free for all or open to another claim.
- It's up to players to respect this as it isn't an official system but has been working very well.
- CLAIMS DON'T WORK ON ANY INSTANCE, no you can't claim Black King or Troll King, those are free for all.