Domains: Green-water shores, new-land arrival, the shore that becomes home, and what the homecoming costs without being named.
Era of ascension: Great Expansion (~700 BSD). Cohort: current. Olisea was acclaimed late in the Expansion, three generations after the Arinsfold halflings made their crossing to the new coast — by the founders' grandchildren, in the years the first Arinsfold elders began to die of ordinary age and the second generation was suddenly the elder generation.
Worshipped by: Arinsfold shore-villages along the green-water coast — the boat-keepers, the salt-cookers, the gull-watchers who read landfall by bird-pattern. Shelwin river-coastal halflings share the worship in a reframed inflection: Shelwin doctrine treats Olisea as the patron of the river-mouth specifically rather than the open sea, and the Shelwin shore-shrine is set at the highest point of the river-tide rather than at the sea-mark. Olisea's worship is not carried by any non-halfling polity; the boundary holds. (The worships edge is authored downstream on the worshipper, not here.)
Olisea is the daemon of arrival, and her worship is what the Arinsfold call "welcoming the shore", the rite that turns landfall into home. Gavelos governs the journey across; Olisea governs the moment the keel grates on sand and the journey ends. Her shore-shrines are at the high-tide line, low stone cairns hung with bleached driftwood and the bones of the first season's catch. The Arinsfold welcome-rite is the laying of a stone on the cairn each year at the anniversary of the village's landfall; the cairns grow steadily, and an old Arinsfold village can be dated by the height of its welcome-cairn within a half-century's accuracy.
What the worship does not say is the part the founders' grandchildren built into it. Arinsfold doctrine teaches that the shore welcomes those who arrive and does not ask who left, and the doctrine has a doubled meaning the worship refuses to gloss. The shore-villages were not the first villages on that coast. There had been a population there, a Roulean human population, and within two generations of the Arinsfold landfall the population was reduced by nine in ten to a sickness the Arinsfold survived through and the natives did not. The Arinsfold do not discuss the founding. The silence is doctrinal. Olisea was acclaimed by the third-generation grandchildren as the daemon of the shore that becomes home, which is the same as saying she was acclaimed as the daemon of the silence that makes it home.
A welcome-cairn keeps two kinds of stones, and only the Arinsfold know the distinction. The first kind, smooth and sea-rounded, is the stone laid for the landfall anniversary. The second kind, sharper and inland-broken, is the stone laid by an Arinsfold who has come to the cairn knowing something they have not said aloud. The cairns carry both. Olisea accepts both. The lore-handle the shore-priests keep is: "the shore welcomes those who arrive; it does not ask who left". The pause the Arinsfold elder takes before the second clause is, in welcome-priest training, the worship.