I would like to leave a suggestion to open all chests independent of level, that is, when the player reached level 11, they would have all chests available, from seal trasure to GGN trasure. I would also like to suggest an event for spending on the bond treasure, it can be an event that gives some outdated ninja or magatamas or coupons, but it would already make sense for the player to gather these resources. the "exchange" system is already open when the player reaches level 11, so it doesn't make sense for chests to be leveled by levels, it would be much better if the chest system were opened all level 11.