Star of Life is a stackable item in Frosaken world. It has the following description:
Using Star of LifeEdit
Go to Hicks in Nightfall Citadel. Choose the Pet Soulcombine option when talking to him. The following menu appears:
When clicking Combine, the indicated amount of Soul Coins will be consumed, along with one Star of Life. If the combination is successful, a chat message will appear: "Pet combining successful".
In this example, when hovering over the pet stone, it indicates that the Health Talent is now Lv1.
Obtaining Star of LifeEdit
The following is a list of ways to obtain a Star of Life