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Elder

Always drops one unique and one Uber Elder fragment (Terror or Emptiness). The fragment covers a good part of the entry by itself.

Watcher's Eye (40%) and Elder's Exalted Orb (12%) do most of the remaining work. Void of the Elements at 0.5% is a bonus, not a plan.

Entry

Guaranteed unique

Exactly one of these drops.

ItemChance
Cyclopean Coil (unidentified)30%
Blasphemer's Grasp (unidentified)26%
Nebuloch (unidentified)8%
Hopeshredder (unidentified)8%
Shimmeron (unidentified)8%
Impresence (unidentified)20%

Guaranteed fragment

Exactly one of these drops.

ItemChance
Fragment of Terror50%
Fragment of Emptiness50%

Additional drops

Each item rolls separately.

ItemChance
Watcher's Eye (2 mod unidentified)40%
Elder's Exalted Orb12%
Orb of Dominance2%
Void of the Elements0.50%
Eldritch Blasphemy Support 1 010%

Source: poewiki