The Tibia Mariners are the canon's gentlest, eeriest figures, pale boatmen who pole through fog-shrouded reaches of every great lake in the Lands Between, drifting upright in vessels barely larger than their bodies. Their craft is necromantic command. The Tibia's Summons sorcery, named for them, gives their function in two clauses: 'Sorcery of the servants of Death. Summons a group of Those Lost in Death. Three skeletons will appear some distance from the caster and attack foes before disappearing.' The flavour text adds the sentence that names what the Mariners are for: 'The dead have long been left to wander; what they need is leadership.'

Their boats give the canon its small image of an old psychopomp tradition, an image the text invites the reader to recognise rather than a voyage it records. No item text names them keepers of graves or boatsmen; the canon gives them only their sorcery, and it is an office rather than a voyage. The game claims the office, not the crossing: what the Mariners are for, as their own sorcery says, is leadership over the dead who wander. The skeletons that crawl from cracked stone tombs and reform after every defeat are the Mariners' standing crews.