Core of the Problem is a level 51 Elyos quest in AION Retail 5.8. It rewards 5,647,915 experience.

Objectives

Bring

Item	Count
Blue Searcher Core	1
Shining Searcher Core	1
Old Searcher Core	1
Light Searcher Core	1

Rewards

Experience

5,647,915

Choose one

Item	Count
Elite Rank 2 Elyos Tunic	1
Elite Rank 2 Elyos Jerkin	1
Elite Rank 2 Elyos Hauberk	1
Elite Rank 2 Elyos Breastplate	1
Elite Rank 2 Elyos Magic Hauberk	1

Quest drops

NPC	Item	Chance
NPC name unavailable	Blue Searcher Core	100.00%Share of this group’s roll that yields the item.
NPC name unavailable	Shining Searcher Core	100.00%Share of this group’s roll that yields the item.
NPC name unavailable	Old Searcher Core	100.00%Share of this group’s roll that yields the item.
NPC name unavailable	Light Searcher Core	100.00%Share of this group’s roll that yields the item.