Before you begin make sure that you have one mark of Chivalry
Go to 'The Eagle Market' (You can hunt the Earl to find it) BOW STATUE.
Make sure you get the blessing then head straight to the next location, it is timed.
Eagle Market to Red Dragon Inn
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Go to Caerleon and in the 'Red Dragon Inn' is a sculpture of a dragon, BOW SCULPTURE.
Go to 'The Top of Mount Snowdow' from Snowdonia it is SWNNU, there you will find a Celt.
Buy the essence you require:
Dragon - Dexterity/Constitution
Hydra - Perception/Dexterity
Wyvern - Mind/Spirit
Go to 'Merlin's Laboratory' in Camelot, GIVE ESSENCE MERLIN.
https://legendhub.org/quests/details.html?id=320
You receive XP, and your stat boost.