Crystal plate mail/zh-CN
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水晶板甲（crystal plate mail）是NetHack中的一种铠甲类防具。它由玻璃制成。
Contents
生成
弗拉德之塔的中层的一个小隔间内必定会生成一件水晶板甲。
高衔级的雇佣兵（包括中尉、上尉和警卫员队长）生成时有一定概率获得一件水晶板甲。
野蛮人、牧师和女武神职业的玩家怪物的起始铠甲有1⁄2的概率会被替换成一件基础AC至少为5的随机铠甲而非龙鳞甲[1][2][3]——该件防具有1⁄8的概率是水晶板甲，因此他们获得水晶板甲的总概率是6.25%[4][5]。
描述
穿戴时，水晶板甲能提供7点基础AC加成和MC2，与板甲类似。由于由玻璃制成，水晶板甲不会阻碍施法，且免疫侵蚀损伤。
策略
水晶板甲是游戏中第二强的不阻碍施法的防具，仅次于龙鳞甲，但由于过高的重量，其实用性很低：大部分施法者角色的起始力量都不高，难以承担水晶板甲的重量。一般等到角色锻炼出足以携带水晶板甲的力量时，他们通常：（1）已经拥有了龙鳞甲，或（2）已经把AC降到足够低，以至于不需要水晶板甲的额外防护了。
即使是高力量值的玩家，也更偏好在获得龙鳞甲之前选择矮人秘银胶衣或精灵秘银胶衣。秘银胶衣可以省下强壮角色至少1⁄3的携带容量（300 aum）且提供的基础AC只少1～2点。不使用金属防具的角色，也可考虑嵌皮甲。
水晶板甲是易碎的，因此在未穿戴时会被打碎，务必小心处理——在售卖水晶板甲的商店里使用力冲击或冲击魔杖时要尤其小心，因为对大多数角色而言，前期游戏中一旦打碎了水晶板甲，想要付清店主的欠款并不容易。
历史
水晶板甲最初于NetHack 1.3d加入游戏。
Variants
UnNetHack
In UnNetHack, Knights get a weight reduction for any body armor heavier than studded leather armor, making crystal plate mail a more feasible option for them in particular.
dNetHack
In dNetHack, there is now crystal armor for each part of the body - crystal armor doubles enchantment bonuses (adding full enchantment to both AC and DR, rather than half to each) and can be enchanted safely to +7, so a fully enchanted crystal plate mail can provide high defense.
Crystal plate mail still does not inhibit spellcasting, and its weight is also reduced to a more tolerable 170 aum, but does not provide any magic cancellation. A set can still be found in the same place within Vlad the Impaler's dwelling, which is now the Windowless Tower.
For Samurai, crystal plate mail goes by the name "jade o-yoroi".
xNetHack
In xNetHack, while crystal plate mail is not changed directly, armor with glass as its base material can be shatter-proofed through the usual methods of erosion-proofing armor (e.g. reading a scroll of enchant armor while confused). Worn armor is also subject to a 1⁄4 weight reduction, making crystal plate mail slightly more viable.
Dragon scale mail is replaced with dragon-scaled armor in xNetHack, significantly changing which armor is viable or even "optimal" for a given character; crystal plate mail is likely to be overlooked in favor of comparable mail with a lighter material, such as bone or mithril, for use with dragon scales.
EvilHack
In EvilHack, crystal plate mail is changed considerably. Its weight is reduced to 150 aum, and its base material is gemstone instead of glass, making it shatterproof. It is also immune to disintegration and the revamped destroy armor monster spell, which can now erode armor even if the target has magic resistance.
EvilHack applies a spellcasting penalty to all roles for any worn body armor, with crystal plate mail as the sole exception. Dragon scale mail is replaced with dragon-scaled armor in EvilHack as well - crystal plate mail is among the most enticing armor to merge dragon scales into for casting-focused roles.
High-ranking, non-giant soldiers and watchmen have a chance of generating with crystal plate mail as usual. The Paladin, the Infidel quest nemesis, will always generate with crystal plate mail.
