Base creature values. Events, world settings, difficulty and loot bonuses can change an encounter.

The Nightmare Beast
Bosstiary · ArchfoeBoss rewardCreature resistance values; world limits may adjust them. Negative values indicate a weakness.
Paralysis · Invisibility
Base chance per roll, not a guaranteed reward. Bonuses, world multipliers and boss participation change the result. Charged items use their own quantities. Container contents also require the container to drop.
piggy bank · 1 · 100%
platinum coin · 1–9 · 100%
silver token · 1–4 · 98.11%
piggy bank · 1 · 94.34%
mysterious remains · 1 · 93.4%
energy bar · 1 · 91.51%
ultimate mana elixir · 1–29 · 64.519%
gold token · 1 · 64.15%
supreme health tonic · 1–29 · 58.06%
ultimate soul essence · 1–24 · 58.06%
yellow gem · 1–2 · 45.16%
red gem · 1–2 · 41.94%
huge chunk of crude iron · 1 · 38.71%
crystal coin · 1–3 · 22.58%
green gem · 1 · 19.35%
gold ingot · 1 · 16.129%
runic hammer · 1 · 12.9%
dawnstar mace · 1 · 10.38%
giant shimmering pearl · 1 · 9.68%
ice shield · 1 · 9.68%
magic sulphur · 1 · 8.49%
dragon figurine · 1 · 7.55%
turquoise tendril lantern · 1 · 7.55%
purple tendril lantern · 1 · 6.6%
blue gem · 1 · 6.45%
giant ruby · 1 · 6.45%
violet gem · 1 · 6.45%
royal star · 1–193 · 4.839%
ring of the sky · 1 · 4.72%
soul stone · 1 · 4.72%
the beastmorph mask · 1 · 4.35%
beast's nightmare-cushion · 1 · 3.77%
soulshadow mask · 1 · 3.23%
gilded staff · 1 · 3.13%
enchanted sleep shawl · 1 · 2.83%
ironcleaver axe · 1 · 2.83%
giant sapphire · 1 · 2.83%
giant emerald · 1 · 1.89%
ring of green plasma · 1 · 1.612%
gilded feather pendant · 1 · 1.29%
ring of red plasma · 1 · 0.968%
verdant heart pendant · 1 · 0.968%
crimson coil pendant · 1 · 0.645%
ring of blue plasma · 1 · 0.323%