"Under the mysterious power, you can summons a hero between 3 and 5-stars."A Moonstone of Mystery is one of the premium way of summoning that let you summon a Hero between 3 to 5 stars. The summoned hero has a small chance to be summoned as an Awaken Hero. Moonstone of Mystery can be acquired in all area in Dimension Gate except Secret Dungeon. Moonstone of Mystery can also be obtained by completing certain Mission or bought from the Golden Cart or Store (as a package). Furthermore, Moonstone of Mystery can be obtained as a reward from the Cave of Trials as well.
Moonstone of Mystery can only summon Heroes with Fire, Water, or Wind Affinity, also Material Type Heroes cannot be summoned by Moonstone of Mystery. The summoning cost is 10,000 Gold and the Moonstone of Mystery will be consumed in the summoning process.