Choose by mode and obstacle, then verify the skill location and visible effect in the current game; exact names, locations, and cooldowns stay unknown without current official or reproducible evidence.
The official description confirms special abilities, but it does not publish a current skill roster. Choose from effects visible in your server and judge them against one mode-specific problem.
For Grow a Chicken Fighter skills, the best skill is the one whose visible effect improves your current Pit, Tower, or progression obstacle under the same test conditions.
Use this skill evaluation and source-verification method to decide where verified location and effect data must come from. What remains unknown stays clearly unclaimed.
The best skill for Pit may not be the best skill for a Tower wall. Keep the roster and test conditions stable, change one ability, and compare the result.