A funny and witted little witch.

Angry GloomLylia gains power from Gloom, increasing her Movement Speed by 15%. Each Gloom upgrade further increases this bonus by 5%. Gloom gains an upgrade each time he devours Shadow Energy, up to 5 times. Higher levels increase the detonation damage of Shadow Energy.
Lylia counters Tank heroes without Blink skills, such as Carmilla and Hylos, who cannot easily escape Gloom's AOE range and are more susceptible to Lylia's high sustained damage.
Since most of Lylia's damage comes from detonating her 2nd Skill, but setting up Gloom can be quite slow, nimble Assassins like Nolan and Ling counter Lylia as she'll have a tough time hitting them.