Background
Distilled from the ichor of demons, zeal was originally used by Tal'Dorei's ancient berserkers to grant them incredible strength and courage before battles. These days, it's most commonly used by criminal bruisers before a brawl. Most modern warriors stay well away from zeal, due both to its addictive nature and to the mental and physical degeneration it can cause over long periods of time. When prepared properly, zeal is a purple, ashy-tasting gel that typically costs 150 gp per dose.

Bonus Action
After slathering zeal across your exposed skin as an bonus action, you must make a DC 12 Constitution saving throw. On a failure, you become paralyzed for 1d4 rounds as your muscles lock up. On a success, you gain one additional attack. After this, the effect ends and you gain one level of exhaustion.