Cobalt Chests

A Cobalt Chest is a Limited Time Chest. It was introduced to the game with the.

About
are mainly used as Mystery Reward Offer, their content depends on the type of event:
 * For Major Events, they contain Event Relic Tokens, and Event Currency that help the player during the event. This chest is offered only if the players watch an ad.
 * For The Tower Challenge Events, they contain a Refresh Token, and  that help the player during the event. This chest is offered only if the players watch an ad.