Every chest and monster that can drop Crimson Bat Eye, with the drop chance in each zone and Gyldening Intensity. A range means the rate shifts with party size and map district.

Treasure chests

Fungus

Brandrgarde · Normal1.3%–45.3%Brandrgarde · Cataclysm18.8%–34.7%

Gilded Chestbest: Drill Yard, Melting Quarter, Abyssal Reach (North)

Hallowgrove · Chaos8.3%–22.6%Normal (either zone)8.1%–22.1%Brandrgarde · Cataclysm3.7%–10.2%

Gift of Fatebest: Drill Yard, Melting Quarter, Abyssal Reach (North)

Hallowgrove · Chaos1.5%–22.6%Normal (either zone)0.26%–22.1%Brandrgarde · Cataclysm3.3%–17.2%

Copper Chestbest: Drill Yard, Melting Quarter, Abyssal Reach (North)

Normal (either zone)8.1%–22.1%Hallowgrove · Chaos5.2%–21.7%Brandrgarde · Cataclysm4.3%–12.1%

Nobleman’s Chest

Normal (either zone)8.1%–22.1%Hallowgrove · Chaos8.0%–21.7%Brandrgarde · Cataclysm4.3%–12.1%

Thermal Vent

Brandrgarde · Cataclysm18.8%Brandrgarde · Normal1.3%

Hollow Stump

Brandrgarde · Cataclysm18.8%Hallowgrove · Chaos7.5%Normal (either zone)1.3%

Silver Chestbest: Drill Yard, Melting Quarter, Abyssal Reach (North)

Brandrgarde · Cataclysm6.2%–17.2%Normal (either zone)5.8%–16.1%Hallowgrove · Chaos5.0%–13.9%

Goods

Brandrgarde · Cataclysm3.3%–17.2%Normal (either zone)0.26%–16.1%Hallowgrove · Chaos1.5%–13.9%

Iron Chestbest: Drill Yard, Melting Quarter, Abyssal Reach (North)

Brandrgarde · Cataclysm5.7%–15.9%Hallowgrove · Chaos5.4%–15.1%Normal (either zone)2.7%–7.6%

The Exiled

Brandrgarde · Cataclysm3.3%–15.9%Hallowgrove · Chaos1.5%–15.1%Normal (either zone)0.26%–7.6%

Military Chest

Brandrgarde · Cataclysm5.7%–15.9%Hallowgrove · Chaos5.4%–15.1%Normal (either zone)2.7%–7.6%

Forgotten Tomb

Brandrgarde · Cataclysm5.7%–15.9%Hallowgrove · Chaos5.4%–15.1%Normal (either zone)2.7%–7.6%

Shipwreck

Hallowgrove · Chaos5.4%–15.1%Hallowgrove · Normal2.7%–7.6%

Timber Chest

Brandrgarde · Cataclysm3.3%–9.3%Brandrgarde · Normal0.26%–0.75%

Civilian Chest

Brandrgarde · Cataclysm3.3%–9.3%Hallowgrove · Chaos1.5%–4.3%Normal (either zone)0.26%–0.75%

Mistchaser's Satchel

Hallowgrove · Chaos2.1%Brandrgarde · Cataclysm2.1%Normal (either zone)0.97%

Monsters

Gylden Corroded Soldier, Berserker, Strawer Chief, Fungus Matron +3 more

Brandrgarde · Cataclysm3.9%–16.7%Hallowgrove · Chaos3.6%–15.8%Normal (either zone)1.0%–5.0%

Frenzied Wizard

Hallowgrove · Chaos2.1%–13.9%Brandrgarde · Cataclysm2.1%–13.9%Normal (either zone)0.51%–5.0%

Flesheater

Normal (either zone)2.2%–8.5%Hallowgrove · Chaos2.1%–6.3%Brandrgarde · Cataclysm1.3%–3.6%

General Harald, Sálmar, the Cursed Moonwane

Normal (either zone)5.9%–8.5%Hallowgrove · Chaos2.1%–5.9%Brandrgarde · Cataclysm1.3%–2.2%

Parading Corpse, Elite Corroded Soldier, Elite Corroded Priest, Elite Corroded Archer +8 more

Brandrgarde · Cataclysm1.2%–6.4%Hallowgrove · Chaos1.1%–5.2%Normal (either zone)0.39%–1.9%

Golden Woodling

Brandrgarde · Cataclysm4.1%–6.3%Hallowgrove · Chaos3.6%–5.9%Normal (either zone)1.0%–1.8%

Tyrannical Executioner, Twinblade Warrior Statue, Soulgnawer

Hallowgrove · Chaos3.6%–6.3%Brandrgarde · Cataclysm2.1%–3.6%Normal (either zone)2.2%–3.3%

Corroded Soldier, Sacred Chamber Priest, Corroded Guard, Corroded Archer +9 more

Brandrgarde · Cataclysm0.21%–0.60%Hallowgrove · Chaos0.10%–0.30%Normal (either zone)0.02%–0.05%

Rates are the chance per chest opened or monster looted. Low rolls also build up the drop guarantee, which upgrades a future drop to Legendary once it fills.