Growth
Catch-up: a second hero and coming back
A second Keeper on the account grows faster: the experience bonus measures the gap to the elder one and melts as it closes. The last fifth of the road the new hero walks on their own.
Growth
After a long absence, experience for the missed days is set aside in a reserve — up to ten levels. The reserve is FINITE: it spends itself as you fight and refills only with newly missed days.
Catch-up does not share the ceiling on environment bonuses: it measures a gap, not the conditions of play. The breakdown is in the Hearth Hall, under “breakdown”.
Everything here is taken from the game’s own reference — the same one a Keeper opens in town. Русская версия статьи.