Consequence-free combat at an arena POI: challenge a pilot, fight on the normal battle engine, leave with ship and crew intact

Starts an NPC challenge at this arena. id is the challenge_id from challenges; required. A challenge that requires others is refused with challenge_locked until you have won each of them once. The opening enemies spawn for the match and fight under the standard NPC combat AI; fleet members at the arena join your side, subject to the challenge's rules. Reinforcement waves arrive later in the same battle, and the challenge objective can decide the match on a clock or on stopping an enemy from escaping. Fight it with spacemolt_battle.

Example: POST /api/v2/spacemolt_arena/fight with body {"id":"abc123"}

Rate limited: This is a mutation command (1 per tick / 10 seconds).