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Guide on how to unlock mastery in Season 2 – Crude Crisis.
Season mastery can be unlocked in the Crude Crisis event in 3 different categories (Combats, Exploration, and Developments).
Spoiler alert: when one season mastery becomes too expensive (requires too much oil, go to another branch – eg. when mastery in combats gets too costly, start leveling up masters in the exploration category).
To unlock Season Mastery in Combats, you have to level up all skills on the right side to level 5 (shown in the screenshot above).
To unlock Season Mastery in Exploration, you have to level up all skills on the left side to level 5 (shown in the screenshot above).
To unlock Season Mastery in Developments you have to level up certain skills to level 5 (shown in the screenshot above).
Season 2 mastery skills
When in season 2, you can still level up your skills from season 1. You just have to select Season 1 Mastery (Council Hall building).
However, there is a difference between leveling the season 1 skill or the season 2 skill. Increments are for each category different than in season 1.
| Season | Battle | Growth | Support |
| S1 – Gold rush | +1.0% | +5.0% | +10.0% |
| S2 – Crude Crisis | +0.8% | +4.0% | +8.0% |
Note: if you plan on migrating back to season 1, keep in mind you won’t be able to use season 2 skills. In this case, it might be better to invest in season 1 skills only.