You can now talk to the black spirit to get either a 20% combat exp buff or 8% skill exp buff that last 30 minutes for 50 energy each. : r/blackdesertonline
BDO Guide: 50% markup with one single buff - a way to become a magnate with the desert trade buff - Inven Global
BDO | Black Desert Online: All existing "E-Buffs" [09.06.2020] - Album on Imgur