# Change Skill Set

Updated on January 3rd, 2023. Actual in-game values may vary from those shown in this document.
Each Mongen can prepare a certain number of skills at the same time. However, Mongen can only use one of them in each battle. This skill is called Active Skill
The number of skills that can be prepared and the rarity of the skill depends on the rarity of the part in Mongen's DNA.
User can change the skill mongen is using by using Skill Stones
The list and icons of Skill Stones are as follows:
 Icon Item Description ​​ Normal Stone When used, randomly choose one of prepared Basic Skill (exclude current Active Skill) as Active skill. ​​ Reroll Stone When used, chosen prepared Basic Skill is replace by the new skill that is not in list of prepared skill randomly. If Active Skill is chosen, the new replaced skill will be set as Active Skill. ​​ Normal Ancient Rune When used, randomly choose one of prepared Ultimate Skill (exclude current Active Skill) as Active skill. ​​ Reroll Ancient Rune When used, chosen prepared Ultimate Skill is replace by the new skill that is not in list of prepared skill randomly. If Active Skill is chosen, the new replaced skill will be set as Active Skill. ​​ Common Elective Stone When used, chosen prepared Basic Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Uncommon Elective Stone When used, chosen prepared Basic Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Rare Elective Stone When used, chosen prepared Basic Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Epic Elective Stone When used, chosen prepared Basic Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Legendary Elective Stone When used, chosen prepared Basic Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0 ​​ Common Elective Ancient Rune When used, chosen prepared Ultimate Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Uncommon Elective Ancient Rune When used, chosen prepared Ultimate Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Rare Elective Ancient Rune When used, chosen prepared Ultimate Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Epic Elective Ancient Rune When used, chosen prepared Ultimate Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0. ​​ Legendary Elective Ancient Rune When used, chosen prepared Ultimate Skill is replace by the new skill that is not in list of prepared skill by your choice. If Active Skill is chosen, the new replaced skill will be set as Active Skill. Note: You cannot choose skill that have spawn rate equal to 0.