Coliseum

In both Elyos and Asmodian main cities there is a Coliseum. Going here you will find a large open area, much like the ones the Romans used to fight in. Speak to the NPC out front in order to enter.

The coliseum is an open free-for-all battle place where you are able to test out your skills and/or strategies against other players of the same team (if you are Elyos you can only fight Elyos, if you are Asmodian you can only fight Asmodian) with no experience loss on death.

When you enter, you can go either alone, in a group, or in an alliance. When you are with a group or alliance you will be unable to attack your allies.
All of your enemies will have red names, easily separating them from yourself or your allies. This makes setting up organized battles extremely easy (although randoms can and sometimes will still teleport in and start jumping in the middle of battles).

Upon death, you will automatically be teleported back out of the Coliseum and you will be placed right next to the entrance NPC. You can then either rest back your health and mana or you can enter in again!

The possibilities for using the Coliseum are endless, and going there as a Legion could help build class strengths and learn how to properly PvP against others.