Sentinels did not become a Core mechanic after Sentinel League. As such, they are no longer acquirable.
Insomnia Cosmic Apex SentinelDuration: 20 seconds Empowers: 1 enemies Empowerment: 100 Can only Empower The Restless Shade (Level 83) Charge: 5 usesRequires Level 75Destroyed on Empowering target Enemy Map Item Quantity affects number of rewards from Empowered Enemy 25% increased Character Size (Hidden)
Empowered Monsters drop (8-12) <<Random reward type>> Rewards
Empowered Monsters drop (8-12) Currency RewardsEmpowered Monsters drop (8-12) Divination Card RewardsEmpowered Monsters drop (8-12) Fragment RewardsEmpowered Monsters drop (8-12) Map RewardsEmpowered Monsters drop (8-12) Scarab RewardsEmpowered Monsters drop (8-12) Sentinel RewardsEmpowered Monsters drop (8-12) Unique Rewards
UnmodifiableHe feeds on the nightmares of the Atlas' denizens. If you fall asleep in the Atlas, he'll be waiting...
Acquisition Not in gameMetadata Item class: Sentinel
Insomnia is a uniqueCosmic Apex SentinelCosmic Apex SentinelDuration: 20 seconds Empowers: 1 enemies Empowerment: 100 Charge: 5 usesUnmodifiable.
Can only Empower The Restless Shade (Level 83). Adds the following abilities:
Fires multiple SoulrendSoulrendChaos, Spell, AoE, Duration, Projectile Level: (1-20) Cost: (14-26) Mana Cast Time: 0.80 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 170%Requires Level 28Fires a projectile that turns towards enemies in front of it, damaging and piercing through those it hits, and leeching some of that damage as energy shield. As the projectile travels, it repeatedly applies a short but powerful chaos damage over time debuff to each enemy in an area around it.Deals (21-885) to (31-1327) Chaos Damage Projectiles Pierce all Targets Deals (180.8-2642.5) Base Chaos Damage per second Base duration is 0.60 seconds Modifiers to Spell Damage apply to this Skill's Damage Over Time effect 4% of Spell Damage Leeched as Energy Shield
Additional Effects From 1-20% Quality: Base duration is (0.01-0.2) secondsPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. projectiles which apply Withered on hit
Coffin attack now covers entire arena in coffins
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The random reward type is chosen randomly between the following types: