Heaven's 
Guardian is a level 2200 boss from the 
Heavenly Dimension in the 
Third Sea. A guardian angel armed with the ancient 
Light fruit awakened and the 
Aura, it unleashes attacks that are nearly impossible to dodge given how quickly they start. It is linked to the Soulless scroll quest.
How to get it
It only appears during the Soulless scroll quest - light the third torch in the Heavenly Dimension to make it appear. Prepare for level 2200 and bring gear to withstand its attacks, as they launch with almost no warning.
How to defeat it
Its awakened Light attacks come out very fast. Divine Arrow can be countered with the 
Instinct trick, Lightspeed Destroyer is avoided by dashing around it and keeping your distance, and against Wrath of God (a rain of explosive rays), stay in the air. Bring gear to endure it - the fight forgives little.
Our take
Not a farm boss - it is a quest boss to defeat in order to progress through the Soulless scroll, and one of the most intense duels in the Third Sea.
Update history
Boss : Heaven's Guardian·Released : Update 17.3
Bosses
Cursed Captain
Cursed Skeleton Boss
Cyborg
Darkbeard
Diamond
Don Swan
Dough King
Fajita
Fishman Lord
Gas Knight
Gorilla God
Greybeard
Heaven's Guardian
Hell's Messenger
Hydra Leader
Ice Admiral
Indra Egg
Island Empress
Jeremy
Kilo Admiral
Kitsune Lord
Leviathan
Lightning God
Longma
Luckymaxer