Forsaken is Shadow's core archer. These archers are most effective against medium-sized creatures. They do three damage per second, upgradable to four. Without frenzy and upgrades, Forsaken have the second weakest damage, next to Master Archers (6 dmg per arrow and 3 dps vs. 5 dmg per arrow and 2.5 dps).
Frenzy certainly makes Forsaken a formidable archer, enough to kill the more expensive Windweavers with their Multishot, though its cost is quite substantial: loss of the unit. When Frenzied, they do the same damage as upgraded Sunstriders (12 dmg per arrow), and when upgraded, they are even more lethal (9 dmg per arrow, 17 dmg per arrow Frenzied), particularly against medium-sized creatures. Frenzy makes them do 8.5 damage per second for 20 seconds, after which they die.