The Vaneen are masters of stealth, known for their superior senses and natural ability to go without sleep for long periods of time. These unique talents make them prime candidates for the Nightwatcher role. Moving unseen through the shadow of the day, these particular Nightwatchers protect the realm of Vanmark from dangerous creatures and sinister plots.
As its Class suggests, this Nightwatcher is capable of dealing lots of damage quickly. Counter this by using Defensive Class characters and focusing actions on the Nightwatcher at the start of the game.
(Quoted from the Vanmark Nightwatcher card Etsy page)