Darth l33t: start of replacement for GDSM versus SDSM article

2026-08-12T18:01:31Z

start of replacement for GDSM versus SDSM article

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In ''[[NetHack]]'', [[dragon scale mail]] is considered the best class of [[body armor]] in the game, due to its high AC, light weight, lack of spellcasting penalty, and providing at least one valuable [[extrinsic]]. Of the ten colors of DSM, several are worth considering depending your character's needs.

==Gray or silver==
[[Reflection]] and [[magic resistance]] are valuable properties that are useful for the entire game and cannot be acquired as intrinsics. For this reason, the traditional use of an early-game wish is for either [[gray dragon scale mail]] or [[silver dragon scale mail]]. Which of the two is more useful is highly situational.

A player who has one extrinsic should almost always wish for the armor which provides the other, but when one has neither, it is dependent upon things such as current HP, conducts, pets, and general style. For example, if you get an early wish and are not adhering to any conducts or time-consuming strategies, SDSM is often better. This is because reflection provides immediate protection against the commonly encountered attack wands and breath weapons, while a player with only GDSM is not protected against rays of fire, lightning, cold, sleep, and disintegration unless they have already attained the proper resistances.

Sometimes the armor that would be most useful immediately is not the one that you intend to include in your [[ascension kit]]. In this case, you must choose between maximizing immediate utility, and conserving wishes in the long run.

===Gray===
* Magic resistance protects against many [[monster spell]]s, including particularly nasty ones such as destroy armor and touch of death.
** ''Monsters capable of casting the more dangerous spells (such as [[golden naga]]s and [[Lich (monster class)|liches]]) usually only appear relatively close to the [[castle]]. There, you will have more opportunity to wish for magic resistance.''
** ''Bear in mind that attack spells generally require the monster to be in melee range, so careful use of missile attacks and/or [[Elbereth]] can mitigate this danger to some extent.''
* Magic resistance protects you from [[wands of striking]], which cannot be reflected.
** ''Wands of striking do much less damage than the elemental wands, and will not damage your equipment.''
* Magic resistance provides protection from teleport and level-teleport traps, which can place unwary characters in dangerous situations.
** ''Level teleporters are more likely to take you up. Fully exploring levels top-down makes those destinations safe.''
* Magic resistance protects you fully from [[polymorph trap]]s, and allows you to safely displace your [[pet]]s onto them.
** ''SDSM provides partial protection against polytraps: you will turn into a [[silver dragon]]. This destroys your cloak and shirt, and reverts your mail to scales but leaves it intact. This will not protect you or your armor against subsequent polymorphs while in silver dragon form. Also, neither suit protects against polymorphs caused by [[lycanthropy]].''
** The readily-available [[iron shoes]] will absorb the effects of the polytrap and transform into [[kicking boots]], which also block polytraps and transform back into iron shoes.
*** ''Low-level players will rehumanize quickly, and a silver dragon is a good fighting form until then.''
*** ''[[Lycanthropy]] can be almost completely prevented by [[magic cancellation]], and cured e.g. by prayer.''
* Connected to the previous point, GDSM's magic resistance protects the GDSM itself against polymorph traps, meaning that if it is the item you obtain from an early wish, it avoids the scenario in which a polymorph trap ruins most of the benefit from the item you wished for.
* Reflection is usually easier to obtain without wishing than magic resistance, particularly because of the possible [[amulet of reflection]] in [[Sokoban]] and the possible [[shield of reflection]] on [[Medusa's Island]]. Spending a wish or genocide scroll on GDSM makes it easier to obtain both properties, since magic resistance would usually be obtained by wishing for a [[cloak of magic resistance]] or [[quest artifact]] anyway.''
** ''Medusa's shield only comes rather late in the game, and close to the Castle wand of wishing.''
* Obtaining magic resistance from your suit frees up your [[cloak]] slot. This allows you to wear something more useful, such as a [[robe]] or [[oilskin cloak]].
** ''On the other hand, you will need to employ an [[amulet of reflection|amulet]], [[shield of reflection|shield]], or the [[Longbow of Diana]] for reflection.''
* [[Crowning]], should the player have access to it, will protect against the wands that magic resistance gives no defense against.
** ''The player still needs to protect their items in open inventory from damage. It is difficult to crown without obtaining a [[luckstone]]. Crowning does not grant [[disintegration resistance]].''
* [[Chaotic]] players cannot get magic resistance by wishing for another role's [[quest artifact]].
** ''Chaotic [[monk]]s and [[wizard]]s are still guaranteed a magic resistance artifact in their own Quest.''

===Silver===
* Reflection protects you and your equipment from wands and breath attacks of fire, cold, and lightning, which are rather common and can deal tremendous amounts of damage.
** ''You can protect scrolls and potions against only fire and cold by placing them in a container. Rings and wands kept at the ready will still be vulnerable to lightning. In particular, only SDSM protects your [[escape items]].''
* Reflection protects you from a [[black dragon]]'s disintegration breath.
** ''A shield will be disintegrated first, which usually gives you enough time to [[escape item|escape]] or leave the line of fire.''
** ''[[Disintegration resistance]] can also protect you and your armor, but is difficult to obtain without defeating a black dragon.''
* Reflection protects you from wands and breath attacks of sleep.
** ''[[Sleep resistance]] will also protect you from these.''
* Accidentally attacking a [[floating eye]] will not paralyze you.
** ''Careful play will usually prevent floating eye accidents, as will a [[ring of free action]].''
* While both suits protect against a [[wand of death]], reflection gives a chance of killing the zapper on a [[rebound]], preventing him from wasting valuable charges.
** ''This does not apply to [[Orcus]], who is a demon and therefore immune to his own wand of death.''
* Obtaining reflection from your suit frees up your [[amulet]] and off-hand slots. This allows you to wear another amulet (such as [[amulet of life saving|life saving]]), and potentially allows [[two weapon combat]] and combat spellcasting.
** ''On the other hand, you will need to employ a [[cloak of magic resistance|cloak]], a (possibly wished-for) [[quest artifact]] or [[Magicbane]] for magic resistance.''

==Blue==
[[Blue dragon scale mail]] provides very fast [[speed]], much like [[speed boots]], which frees up your [[boots]] slot for another pair. They also provide extrinsic [[shock resistance]], which protects your [[wand]]s and [[ring]]s from [[lightning]] 99% of the time. With all the intrinsic resistances and a source of magic resistance, it becomes feasible to forego reflection, provided you keep your important [[scroll]]s and [[potion]]s in a bag.

==Green==
[[Green dragon scale mail]] provides [[poison resistance]] and [[sickness resistance]]. The combination of the two blocks several sources of [[instadeath]] or ruinous [[HP]] and [[attribute]] loss. They also greatly expand the pool of [[corpses]] that are safe to eat, making early-game [[nutrition]] management easier. In the end-game, the armor blocks [[Pestilence]]s potential instadeath, making the [[Astral Plane]] somewhat less perilous.

==Orange==
[[Orange dragon scale mail]] grants [[free action]], otherwise only available from a ring, and [[sleep resistance]], which is difficult for non-[[elf (starting race)|elven]] [[vegetarian]] players to acquire as an intrinsic (and which the ring does not provide).

==Yellow==
[[Yellow dragon scale mail]] grants [[acid resistance]] and [[stoning resistance]]. Neither is available as a permanent intrinsic, and the latter avoids some instadeaths and makes wielding a [[cockatrice]] corpse safer.

==Variants==
===SLASH'EM===
In general, one will still want to wish for gray or silver dragon scale mail as a first wish in SLASH'EM, and all the above arguments apply similarly. However, there are additional aspects to consider:

* Lawful heroes may prefer gray dragon scale mail since they have access to minions with reflection via prayer or sacrifice, such as [[Movanic deva (SLASH'EM)|movanic devas]] (from experience levels 7-13) and [[Monadic deva (SLASH'EM)|monadic devas]] (from experience levels 10-16)—both have a {{frac|4}} chance of being generated with a [[shield of reflection]], which can be obtained by having the minion killed (easily accomplished by bringing them near [[Oracle (monster)|the Oracle]]) or stealing it from them while polymorphed into any [[Nymph (monster class)|nymph]].
* Conversely, non-lawful heroes will prefer silver dragon scale mail since an [[elven cloak]] has a {{frac|4}} chance of becoming a [[cloak of magic resistance]] when [[upgraded]] by [[dipping]] into [[potion of gain level]] or using the gnome's [[tinker]] [[technique]].

Additionally, three types of dragon scale mail become useful in the later game for heroes with has other sources of magic resistance and reflection. These are [[deep dragon scale mail]] which provides [[drain resistance]], [[yellow dragon scale mail]] which provides [[acid resistance]], and [[shimmering dragon scale mail]] which provides [[Displacement (property)|displacement]]. Drain resistance is a somewhat vital property in SLASH'EM, with [[wand of draining|wands of draining]] being a prominent factor in the late game. However, SLASH'EM provides numerous other ways to get it, in addition to wielding [[Excalibur]] or [[Stormbringer]]. These include an [[amulet of drain resistance]], some new artifact weapons, being a lycanthrope, necromancer, or undead slayer, or wielding [[The Hand of Vecna (SLASH'EM)|the Hand of Vecna]] (which is an item all adventurers will want to get anyway). Acid resistance is more desirable in SLASH'EM because of monsters with very powerful acid attacks, including the feared [[giant shoggoth]], and the [[lab coat]] (SLASH'EM's version of the [[alchemy smock]]) doesn't provide [[MC]] 3. Finally, shimmering dragon scale mail makes it possible to get displacement without the [[cloak of displacement|cloak]], which also doesn't provide MC 3.

===GruntHack===
In [[GruntHack]], thanks to [[object properties]], the discussion of GDSM vs. SDSM is superfluous. As you can wish for a dragonhide cloak of magic resistance of reflection which gives you an [[AC]] 9 cloak with both properties, yellow dragon scale mail is usually a better choice, especially given that spellcasters may cast {{spell of|acid blast}} at you.
{{nethack-500}}
[[Category:Strategy]]
[[Category:Dragon armor]]

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Darth l33t: start of replacement for GDSM versus SDSM article