Hornless unicorns are a variation or sub-species of Unicorn that do not possess horns. During Bringing Home the Bacon, it was implied by Eli that the species was hunted to extinction by Gielinorians for their delicious meat. One of the last hornless unicorns is apparently owned by Sylas.
A Player-owned port update states however that: "Your ship (ship name) has passed an island where natives ride on strange beasts like hornless unicorns" implying either the species may still thrive on the Eastern Archipelago, or that another species similar to hornless unicorns may exist there.
Mod Passata mentions that he specialises in hornless unicorns.
- If you ask Sylas about things he has found during the Grim Tales quest, he will say that he once found a unicorn without a horn. The player will be amazed.