Insight

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Insight is a feature specific to dNethack. It represents the player's ability to see beyond the veil. Players with a high insight will encounter creatures they would otherwise never see.

Methods of Changing Insight

Change Method
+1 Successfully reading the Necronomicon
Successfully reading the Book of Lost Names
Gaining telepathy from a corpse while hallucinating
Drinking a cursed potion of enlightenment
Drinking a cursed potion of see invisible (1 in insight chance)
Seeing an insight-granting monster up close for the first time
+X insight Killing an insight-granting monster for the first time. X is the monster's difficulty/10 - 1.
-1 Drinking a cursed potion of hallucination
-X% insight Amnesia (X is typically 10)

Insight Creatures

Creature Insight to See Creature
Bright walker 10
Lurking One 20 + rn2(21)
Blasphemous Lurker 40
Blessed 40
Mouth of the Goat 60
The Good Neighbour 40
Hmnyw Pharaoh 40
Polypoid being 40
Parasitized Doll rnd(20)
Living Doll rnd(20)
Kuker rnd(20)+rn2(21)

Insight Merchants

In the Gulf of N'Kai in the Neutral Quest, you can encounter a number of peaceful merchants. If you chat to them while wielding an artifact in your main hand, they will offer to take it from you, giving you a "thought" in return. You may have up to three thoughts in your head at once.

Merchant Insight to See Merchant Related Thought Thought's Effect
Bestial dervish 20+rn2(10) clockwise metamorphosis +30% maxhp
Ethereal dervish 20+rn2(10) anti clockwise metamorphosis +3 speed (+25% of normal speed)
Sparkling lake 18+rn2(9) arcane bulwark magic resistance
Flashing lake 16+rn2(8) dissipating bulwark shock resistance
Smouldering lake 11+rn2(6) smoldering bulwark fire resistance
Frosted lake 12+rn2(6) frosted bulwark cold resistance
Blood shower 14+rn2(7) blood rapture heal 30 hp on sneak attacks
Many taloned thing 16+rn2(8) clawmark +30% increased sneak attack damage
Deep blue cube 10+rn2(5) clear deeps poison resistance
Pitch black cube 22+rn2(11) deep sea physical damage reduction
Prayerful thing 25+rn2(13) communion +25% carrying capacity
Hemorrhagic thing 15+rn2(8) corruption lifesteal when injured below 30% hp
Many eyed seeker 17+rn2(9) eye thought 2x death drop frequency
Voice in the dark 19+rn2(10) formless voice +30% max power
Tiny being of light 13+rn2(7) guidance heal when attacking those that hurt you
Man faced millipede 5+rn2(3) impurity physical damage reduction for pets
Mirrored moonflower 10+rn2(5) moon +30% XP gain
Crimson writher 14+rn2(7) writhe sneak attacks restore 30 energy
Radiant pyramid 12+rn2(6) radiance +30% magical healing