Required To Unlock Electro Oceanid Thunder Manifestation The Thunder Manifestation can only be unlocked by completing this whole quest line.
Once you're up to snuff, take on the Winter Tree Fossil to survive waves of enemies, and work your way to challenge Erebjork, a fearsome enemy that wields a Permafrost Axe and Shield.
Approach the Warding Stone Paimon: This must be one of the three remaining Warding Stones.
Only use your character when you're near this rock with an Electroculus and door on it.
A number of Electrogranums on the floating rocks will guide you towards your destination.
You will then be asked to find and talk to Eiko in Seirai Island.