Soulstone
A Soulstone is an item in which a character can store a single skill, then later transfer that skill to another character on the same account.
Currently, there are green Soulstones (from the Samurai Empire Expansion), blue Soulstones, and red Soulstones.
All Soulstones can only be used with the first account to have held them, but the first two types were distributed in the form of tokens - These could be passed to other players before redeeming them for the actual stones. Red soulstones are not awarded as tokens and thus cannot be traded or sold to another account.
While Soulstones have an unlimited number of uses, there are also Soulstone Fragments that have only 5 charges when new.
A player may only use a Soulstone in a safe log-out location, such as an inn or house that you own or are accessed to. You must wait a certain amount of time after leaving combat to use a stone and then only once per 24 hours. Using the stone means storing and then claiming a skill from it or storing and then removing a skill by flushing it from the ston without absorbing it to a character. The 24 hour timer does not start however until you claim the skill so if you store a skill and claim it the next day you must wait 24 hours before storing again.
If a player would like to transfer a skill from one character to another, he or she must be sure that the skill stored in the soulstone or soulstone fragment does not exceed the skill cap on the target character. You cannot claim a stored skill if it exceeds your skill cap.