A Bryll robe bottom is a piece of Tier 5 mage armour that only is available in Daemonheim. it can be made by using a Needle and Thread on three pieces of Bryll cloth, at level 46 crafting and giving 154.8 experience. Although it can only be obtained from Daemonheim, the Bryll Robes set is the best set of mage armour available in free-to-play. With a +7 magic attack bonus, it is the best piece of leg wear for f2p mages. It requires 40 magic and defence to wear.
Bryll robe bottoms, along with all other tiers of robe bottom, can be obtained as a reward for defeating the Necrolord Boss in the occult floors Bryll robes are low level robes for members, so any robes obtained in this manner are likely to be discarded.