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Cumulated and Accumulated Buffs
Cumulative Buff- The cumulative buff is a fixed rate of experience points gained by the apprentices leveling under the supervision of a guardian. The rate of experience cumulated depends on the apprentices level. After one hour of grinding by the apprentice has passed, it is possible to transfer the experience points to the guardian. After 24 hours of being logged into the game, additional experience points will not be cumulated. Right click the cumulative buff icon to confirm transfer of experience to the guardian.
Accumulative Buff- When an apprentice confirms the transfer of the cumulated buff, the set number of cumulated points after the confirmation of the transfer will become a percentage of increased experience for both the apprentice and the guardian. 20% of the cumulated number of points will be added to the experience that the guardian obtains while grinding. The apprentice will receive 80% of the cumulated number as an addition to experience points while grinding. The cumulative buff can only be activated while the guardian is online, which can easily be checked in the Guardian House interface, accessed by the hotkey L. As the number of accumulative experience decreases by 10, the experience gained will increase by 5%. 24 hours after the transfer of cumulated points is transferred, the accumulative buff will disappear.
Here's a link with everything you need to know about an Academy
http://www.silkroadforums.com/viewtopic.php?t=46359 *stolen from RuYi's post*
If you have any other questions please let me know.