When they entered the area where the concentration of Synthetic Evergreen Poison was richer, Seth gave them an evil grin. He was already holding a bottle of corrupted blood, but none of the elves were paying attention on that, they just wanted to finish him off quickly.
Seth threw the bottle towards them and used his darkness to make it break in the air, spreading everywhere.
When those elves noticed that object coming towards them, they just used their Mana to protect their bodies from a possible attack, but they instantly regretted not immediately running away.