Spirit Stones (Emma) and Skill Ambers (Koo) in Beast of Reincarnation are passive accessories equipped in slots that determine stat boosts and various conditional effects. This guide will provide you with some of the best Spirit Stone and Skill Amber synergies in the game. Here are the top 10 Spirit Stones you can get:Spirit Stones Effects Onslaught Battle start boosts Vigor (attack). Here are some of the best ones:Types Skill Ambers Fang Series Frailty Fang (Rupture/weaken), Binding Fang (Bind), Destructive Fang (Destruction/damage + weaken), Aquatic Fang (Water), Shocking Fang (Electric), Poison Fang, Corrosive Fang (Acid). Incense Series Bull Incense (Emma Vigor), Archery Incense (ranged), Golem Incense (defense), Resurrection Incense (revive at 0 HP), Life Incense.