-what is Amphitheater? That's what this whole section is called.
-what is Battle Arena? That's the section most used you would put your battle and quest that have a lot of fighting there.
-how do i write for each one? Most people would write them in third person. Just lot at any numbers of battles that are in the BA section. Other good idea is you could read some of the battles I started. Just go under my profile and hit find all threads started by me.

Hope that helps.

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Wonderful set by, Lady Knives,
Alliance of Tasogare member, Restoring the Luna Bracelet