When your pets reach level 50, they will need Strengthening Serum for further advancements every 10 levels. For example, Strengthening Serum is required to upgrade your pet to advancement levels 50, 60, 70, 80, and so on.
Obtainable through:
- Mystery Shop (Pet Advancement Materials Custom Chest)
- Arena Shop
- Alliance Championship Shop
- Canyon Shop
- Alliance Shop (Pet Advancement Materials Custom Chest)
- Tundra Trading Station
- Packs
Requirements Chart
| Pet Advancement Level | Strengthening Serum |
|---|---|
| 50 | 10 |
| 60 | 20 |
| 70 | 40 |
| 80 | 60 |
| 90 | 80 |
| 100 | 100 |