Difference between revisions of "Shield (stat)"

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(transpose SH info from Shields)
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''This page is about the Shield [[stat]]. For shields in general, see [[Shields]]. For the player [[skill]], see [[Shields (skill)]].''
 
''This page is about the Shield [[stat]]. For shields in general, see [[Shields]]. For the player [[skill]], see [[Shields (skill)]].''
  
'''SH''' is one of your three physical defenses, along with [[AC]] and [[EV]]. It allows you to completely negate physical attacks (both melee and ranged) and some magical attacks. Unlike AC and EV, you have no innate SH score. SH gained from wearing a physical shield is governed by the [[Shields (skill)|Shields]] skill; magical shields are unaffected by skill.
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'''SH''' is one of your three physical defenses, along with [[AC]] and [[EV]]. It allows you to completely negate physical attacks (both melee and ranged) and some magical attacks. Unlike AC and EV, you have no innate SH score. SH gained from wearing a physical shield is governed by the [[Shields (skill)|Shields]] skill; magical shields are unaffected by that skill.
 
 
For more details, see the [[Shields]] page.
 
  
 
==Sources==
 
==Sources==
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*Having the [[Large Bone Plates]] [[mutation]]
 
*Having the [[Large Bone Plates]] [[mutation]]
 
*Using [[The Shining One]]'s Divine Shield
 
*Using [[The Shining One]]'s Divine Shield
*Having enough piety for [[Qazlal Stormbringer]]'s Storm Shield
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*[[Qazlal]]'s Storm Shield passive
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==Blocking==
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<!-- This section is transcribed from the Shields page -->
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You can only block melee attacks (inc. [[reaching]] attacks) and non-penetrating "projectiles" - these include [[ranged weapon]]s and certain spells like [[Iron Shot]] or [[Poison Arrow]].
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What can't be blocked:
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All melee attacks can be blocked (except for successful [[stab]]s), but many ranged attacks are unblockable:
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*[[Penetration|Penetrating]] attacks: [[Javelin]]s, [[Bolt spell]]s, [[Starburst]]...
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*Almost everything with perfect [[accuracy]]: [[Magic Dart]], [[Smiting]], [[Chain Lightning]], Explosions ([[Fireball]], [[Damnation]]), [[Shatter]]...
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:([[Orb of Destruction]] is the only spell that ignores EV but can be blocked)
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*Enchantments: [[Agony]], [[Pain]], [[Confuse]], everything that checks [[willpower]]
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===Calculation===
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If you are wielding a physical shield, its SH is determined as follows:<ref>{{source ref|0.30.0|player.cc|2160}}<br>These values are divided by 200 by later functions.</ref>
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*Your '''Base SH''' is determined by type of shield. 3 for [[buckler]]s, 8 for [[kite shield]]s, 13 for [[tower shield]]s.
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*Add '''[[Shields (skill)|Skill Bonus]]''' of <code>(base_SH/40 + 0.19) * skill</code>.
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**Add another 0.57 if skill ≥ 3, else add <code>0.19 * skill</code>.
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*Add '''[[Dexterity|Stat Bonus]]''' of <code>DEX * 38 * (base_SH + 13) / 5200</code>.
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*Add '''[[Enchant]]ment''' value. +1 enchantment = +1 SH.
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*Add 0.25 SH.<ref>{{source ref|0.30.0|player.cc|2213}}<br>Divided by 2 by a later function.</ref>
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All other sources of SH ([[Qazlal]] shield, [[amulet of reflection]]...) are flat bonuses, and are added on top of the physical shield bonus. The final value is rounded to the nearest integer and displayed as the player's SH value.
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If you are [[paralysed]], [[petrified]], or if [[dexterity]] is 0, then SH is set to 0 regardless of any other factors.
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==To-hit vs SH==
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The game compares the attacker's "pierce value" to the defender's "block value".
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The attacker's pierce value is dependent on their [[to-hit]] (accuracy) and the type of attack:
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* '''Melee attack:''' <code>1d(15 + to_hit/2 + 5×past_blocks^2)</code>
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* '''Ranged attack:'''  <code>1d(1.3×to hit + 5×past_blocks^2)</code>
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The defender's blocking value is equal to:
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* '''All attacks:''' <code>2d(2×SH)/6 - 1.3</code>
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* Divide by 3 against melee attacks from [[invisible]] oponents.
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If the blocking value is greater or equal than the attacker's pierce value, the attack is blocked.
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==Strategy==
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SH is less effective per point than EV (EV succeeds if <code>2d(2 * EV - 1)/2 > 1d(to-hit + 1) - 1</code>; it also blocks against penetrating attacks). However, wearing a shield gives a high amounts of SH. Shield penalties can be reduced and eventually reduced with [[Shields skill]].
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==References==
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<references/>
  
 
[[Category:Stats]]
 
[[Category:Stats]]

Revision as of 23:04, 4 August 2023

Version 0.30: This article may not be up to date for the latest stable release of Crawl.

This page is about the Shield stat. For shields in general, see Shields. For the player skill, see Shields (skill).

SH is one of your three physical defenses, along with AC and EV. It allows you to completely negate physical attacks (both melee and ranged) and some magical attacks. Unlike AC and EV, you have no innate SH score. SH gained from wearing a physical shield is governed by the Shields skill; magical shields are unaffected by that skill.

Sources

The following items/abilities can increase your SH:

Blocking

You can only block melee attacks (inc. reaching attacks) and non-penetrating "projectiles" - these include ranged weapons and certain spells like Iron Shot or Poison Arrow.

What can't be blocked: All melee attacks can be blocked (except for successful stabs), but many ranged attacks are unblockable:

(Orb of Destruction is the only spell that ignores EV but can be blocked)

Calculation

If you are wielding a physical shield, its SH is determined as follows:[1]

All other sources of SH (Qazlal shield, amulet of reflection...) are flat bonuses, and are added on top of the physical shield bonus. The final value is rounded to the nearest integer and displayed as the player's SH value.

If you are paralysed, petrified, or if dexterity is 0, then SH is set to 0 regardless of any other factors.

To-hit vs SH

The game compares the attacker's "pierce value" to the defender's "block value".

The attacker's pierce value is dependent on their to-hit (accuracy) and the type of attack:

  • Melee attack: 1d(15 + to_hit/2 + 5×past_blocks^2)
  • Ranged attack: 1d(1.3×to hit + 5×past_blocks^2)

The defender's blocking value is equal to:

  • All attacks: 2d(2×SH)/6 - 1.3
  • Divide by 3 against melee attacks from invisible oponents.

If the blocking value is greater or equal than the attacker's pierce value, the attack is blocked.

Strategy

SH is less effective per point than EV (EV succeeds if 2d(2 * EV - 1)/2 > 1d(to-hit + 1) - 1; it also blocks against penetrating attacks). However, wearing a shield gives a high amounts of SH. Shield penalties can be reduced and eventually reduced with Shields skill.

References

  1. player.cc:2160 (0.30.0)
    These values are divided by 200 by later functions.
  2. player.cc:2213 (0.30.0)
    Divided by 2 by a later function.