Allied Tags  

Allied tags are obtained during Campaign Battles by a Campaign Arbiter. They are only available during an active Campaign and are lost if you change zones.

With an "Allied Tag" issued to you by an area's C.A., you are able to participate in Campaign Battles, purchase temporary items for Allied Notes, and suffer no Experience Points penalty for KO. However, with tags you are unable to improve combat or magic skills, earn experience points for individual kills, or loot fallen enemies.

Campaign mobs outside cities will only attack players who are participating in Allied Campaign Battles, they will not attack you if you do not have an Allied Tag (unless you generate Enmity). However, regular mobs will still attack you.

Final Fantasy XI Wikibase™