Arena spawn information is stored in a INI under the data section in EOSERV.

Structure

Map ID.enabled = Determines if arena is enabled on the map (yes|no)
Map ID.time = Amount of time between spawning players into the arena
Map ID.block = Minimum amount of players to prevent more players from spawning in
Map ID.spawns = Spawn locations which people are warped from and to {source x,source y, target x,target y}