From AmtWiki

Some Magic and Abilities refer to ‘returning to base’ or otherwise reference the location of a base. Bases may also be used to repair a destroyed weapon, bow, shield, or all armor in one location after 30 seconds at base, or the time period for Respawn, whichever is longer, though this may be adjusted by the game designer. Determine what the bases will be for these abilities for each team. This can be a fixed location, a team reeve, or something else.