Nothing on p99 is a DPS race. Everything falls into a few categories:
Camps - difficult to define broadly, but they generally revolve around a single mob (outdoors) or a section of a zone (dungeons). Often, players will also agree to what constitutes a camp in outdoor zones (say, the halfling guards at the wall), even though this is not *technically* the definition of a camp in an outdoor zone.
FTE - Anything that is not a camp is First to Engage. Important to note that this does not mean first to *damage.* One need not damage a mob to engage it. There are rules about stalling for *raid mobs* but there are not similar rules in place for non-raid mobs (to my knowledge).
If two players are each holding a camp, they have the rights to their mobs, so long as they are keeping the camp clear and engaging mobs within a reasonable time (this is also vague, but generally nice people agree that its ~5 min). You *must* maintain a presence at the camp. If you die/LD/zone whatever, you unfortunately lose the rights to that camp (unless you make it back from LD before your mobs pop, then you should be ok).
Players holding a camp can also contest other mobs on an FTE basis (so long as those mobs are not part of someone else's legitimate camp). If two groups each have a camp in, say, Karnor's Castle, they can each pull from a 3rd unclaimed camp on an FTE basis.
Sorry you're having issues with camps/players at camps. It can be a frustrating experience, particularly at popular camps
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