After completion of Ritual of the Mahjarrat, players can kill glacors, powerful ice elementals residing in the Glacor Cave. Glacors are fairly powerful for their combat level of 112, but are the only monsters to drop steadfast boots, glaiven boots, ragefire boots, and shards of armadyl that can be used to make Armadyl runes or the Armadyl battlestaff. Glacors are also a good source of crimson charms and blue charms. Glacors are unusual in that they must be soloed; only one player may fight a glacor at a time. However, groups of players can individually kill glacors together.