Flask of Experience
Flask of Experience is a flask that increases experience gain by 10% for 4 hours.
Source
Flask of Experience can be purchased from a renown vendor for 500 once the Unlock Flask of Experience guild perk has been unlocked.
See also
[Flask of Greed]
[Flask of Harvesting]
[Flask of Prestige]
[Flask of Renown]
[Flask of Reputation]
[Flask of Speed]