Skill Ambers are a crucial component of combat in Beast of Reincarnation, allowing players to equip Koo with a variety of powerful attacks and support abilities. These items can be slotted into Koo's inventory to exploit enemy weaknesses or break through defenses, making them essential for overcoming challenging encounters. This guide details the locations of various Skill Ambers, focusing on those obtained through gameplay objectives and merchants.
Early Game Skill Ambers
The Frailty Fang Skill Amber, which weakens enemies, is automatically unlocked after a flashback sequence in Chapter 2 that recounts the initial meeting between Emma and Koo. Further into Chapter 2, near the game's first Dragon Vein Shrine, players will encounter a Wolf Elite Enemy. Defeating this foe rewards the player with the Binding Fang Skill Amber, which can bind enemies.
Towards the end of Chapter 2, players can find a Merchant Golem situated just before the Nushi's lair. This merchant sells the Destructive Fang Skill Amber, an attack that damages and weakens enemies.
Chapter 3 Skill Ambers
Chapter 3 introduces several more Skill Ambers. Between the second and third encounters with the Nue Malefact, two separate Wolf Elite Enemies will drop the Aquatic Fang and Shocking Fang Skill Ambers, offering water and electric-based attacks respectively. 
In the northeast area of Chapter 3's Mountainous Region, a Subcity contains a gauntlet of Golems. Defeating these Golems yields the Bull Incense Skill Amber, which strengthens Emma's Vigor.
Also in Chapter 3, a Merchant located just before the Nushi's lair sells three additional Skill Ambers: Archery Incense, which enhances Emma's ranged attacks; Golem Incense, which boosts Emma's defense; and Poison Fang, which inflicts poison damage. Players can purchase these from future merchants if they cannot afford them initially, though acquiring Poison Fang before the subsequent boss fight is highly recommended. 
Chapter 4 and Beyond
Chapter 4 presents another opportunity to acquire a Skill Amber from a Wolf Elite Enemy. After exiting a cave system in this chapter, players will encounter this enemy along the main path, rewarding them with the Corrosive Fang Skill Amber, which deals acid damage.
This guide is a work in progress, and further Skill Amber locations will be added as they are discovered. Some skills, like Lay Landmine and Taunt, are unlocked via the Skill Tree, while others, such as Bottles of Acid, are found as consumables during exploration. This guide focuses on the essential offensive and supportive Skill Ambers obtained through optional objectives and merchants to ensure players don't miss key combat abilities.