# Study
For obtaining or refreshing knowledge of spells, see spellbook.
Study is an attack property that appears in dNetHack.

Description
You or a monster subjected to an attack with the study property will become studied - this status property increases the accuracy and damage of attacks against the target for a certain amount of turns while reducing their effective AC and defense rating. The damage dice of a study attack determines both the amount of turns that the target is considered studied for and the amount of extra damage taken from attacks; the amount is also added as a flat bonus modifier to accuracy for monsters attacking a studied target.

Sources
Studying attacks using various types of hit dice occur with the following attacks, weapons, spells, and items:

The gaze attack of:
All autons (1d11 + 1 for each "tier" of auton above the monoton)
Axus (1d20)
eye of doom (8d8)
aphanactonan assessor (1d20)
Jrt Netjer (3d7)
Stannumach Rilmani (1d20)
yochlol (1d20)
Bael (1d9)
hateful whispers (4d8)
legionnaire (1d6)
Legion (1d9)
arcadian avenger
operator (1d5)
commander (2d5)
truth-seer (1d15)
dream-eater (1d15)
veil-render (1d15)
Weapons:
The Lifehunt Scythe (inflicts cumulative study based on damage dealt to a target monster: 1⁄2 of damage dealt on that target, and 1⁄4 of damage dealt on the wielder)
Bestial claw (inflicts insight-based amount of study)
Crow talons (+3 study per hit)
Crow quills (+4 study per hit)
Any normal lightsaber used in the Makashi lightsaber form (adds skill-based level of study to targets)
Mind blasts from a weapon with the "deep" object property at +2 or lower enchantment (sets studied status for monsters to a length equal to the damage done, unless that is lower than their current studied duration)
Other objects
Vilya (adds +1d20 study to all attacks while worn)
Messages

<foo> studies you carefully.
A monster used a studying gaze on you.

</foo>