Operations

Operations sends out currently unassigned Heroes on time based missions. Typically you will want to use this as soon as you can to level up weaker characters without playing them.

Alternatively, you can use this at the end of your play session on your best character to get them experience while you’re not playing. You can use your gems for a random perk unlock.

This could be anything from a bonus to completion or getting gems for an operation being complete. Whenever you have left over gems from summoning, use them here.