Build:Roger Federer

Full Build Details
This build will net you 90% Mana Cost Reduction so you'll only need to put 1 point in mana. It does rely on enchants to min/max Damage, Mana Cost Reduction, Cool Down Reduction, etc., so if you have any questions on workarounds or alternative options please feel free to message me on my twitch (twitch.tv/pleebson), my youtube (youtube.com/pleebson), or my discord (https://discord.gg/fu9caC).

Enchants:

Antique Plate Sallet - Enchant: "Economy"

Green Copal Armor - Enchant: "Spirit Of Berg" note you can use regular Copal Armor if you don't want to set up the Legacy Chest

Tenebrous Boots - Enchant: "Speed and Efficiency"

Holy Mission Passive Bonuses:

-Make sure you talk to a Friendly Immaculate BEFORE joining the Holy Mission in order to receive the Possessed Boon. They become hostile once you join and you'll have to do a long DLC sidequest to get it.

-Make sure to rescue Zephyrean after speaking with Olielle in Berg and then choose the Divine Assistance reward from Elatt. This will net you an additional 10% Mana AND Stamina Cost Reduction

-Be sure to sacrifice yourself in place of Calixa at the end of the quest chain if you want to become Exalted. This passive DOUBLES your damage (among other things). NOTE - you will be reduced to 1 HP after 30 in-game days and risk being deleted. I recommend doing this only if you want to fight the Unknown Arena bossses.

Caveats:

-You need to buy and use a Mage Tent (there's always one available in Levant) and Gaberry Wine in order to achieve the 90% Mana Cost Reduction

-For MAX damage you need to trigger Lockwell's Revelation by being tired. To do this simply access any bed, or your mage tent :), and max GUARD or REPAIR. You'll grow tired and then very tired after a certain number of hours and you'll still receive the benefits of whichever tent you rested in!

-Be sure to grab the Mist Boon from Cyril Turnbull inside the Berg Chamber Hall. This, combined with Shamanic Resonance, will skyrocket your already cheesy Ethereal (Trap) damage.