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==Damage rate==
Effectiveness of [[Damage Reduced]] and [[Magic Damage Reduced]] is reduced when applied to the damage of the following missile attacks:

{{Text table}} width=67%
|-align=center
!colspan=3|Damage Rate
|-align=center
!width=33%|41/1024 (~1/25)
!width=34%|82/1024 (~2/25)
!width=33%|205/1024 (~1/5)
|-valign=top
|
*[[Arctic Blast]]
*[[Armageddon]] fire
*[[Fire Wall]]
*[[Firestorm]]
*[[Immolation Arrow]] pyre
*[[Meteor]] pyre
*[[Molten Boulder]] fire
*[[Catapult]] meteor pyre
*[[The Countess|{{Ub|=Countess}}]] fire wall
*[[Diablo (World Event)|{{Ub|=Diablo}}]] armageddon fire
*[[Diablo|{{Ub|=Diablo}}]] firestorm
*[[Vampire]] fire wall
*Vampire meteor pyre
|
*[[Inferno]]
*[[Wake of Inferno]]
*{{Ub|=Diablo}} lightning
*[[Fetish Shaman]] inferno
*[[Megademon]] inferno
*[[Claw Viper|Salamander]] fire cloud
|
*[[Wake of Fire]]
|}

*Value normally corresponds to the number of times each missile collides with a target (and thus applies damage) per second: those with 41 typically apply damage every frame (25 times per second), those with 82 typically apply damage every other frame (25/2 times per second) with a stream of missiles (although Arctic Blast is 41, it should be in this category with Inferno). [https://www.theamazonbasin.com/forums/index.php?/forums/topic/86981-inferno-arctic-blast-bug/&do=findComment&comment=1484215] Wake of Fire can apply damage every 5 frames (5 times per second) due to its 4 frame Next Delay.
*Vast majority apply [[Fire Damage]], although Arctic Blast applies [[Cold Damage]], {{Ub|=Diablo}} firestorm applies fire and physical damage and {{Ub|=Diablo}} lightning applies [[Lightning Damage]] and physical damage.
*Intent is to prevent integer damage reduction from being too powerful a counter when small amounts of damage are applied by multiple missile collisions. In Hell {{Ub|=Diablo}} lightning only applies maximum 26.25 base physical and 52.5 lightning damage per collision, which would otherwise be easily negated by DR 40 and [[Lightning Resist]] 75% (base physical damage would be negated and excess DR would then negate base lightning damage after resistance applied); but due to this modification, DR '''492''' (an impossible amount in an unmodified game) is actually required to achieve this (DR 40 and LR 75% only reduce maximum base damage by ~46%).
*However, since damage is typically smaller the more missile collisions are used to apply it, this modification is normally less effective as the number of missile collisions involved increases. In Hell {{Ub|=Diablo}} firestorm only applies maximum base 2 48/256 fire and 240/256 physical damage per collision, although up to 30 missiles can collide with a player with each cast and each missile can apply damage up to 35 times, resulting in up to '''1,050''' collisions (compared to just 17 collisions for each lightning cast at a single stationary target); thus despite the modification, DR 37 and [[Fire Resist]] 75% would still negate base physical damage and excess DR would then negate base fire damage after resistance applied.
 

==Last collide==
Last collide is a property of missiles which normally prevents those which are not destroyed upon collision from colliding with the same target more than once (since a missile can collide with a target multiple times as it passes through it, or remains over it).

[[File:Last Collide.png|frame|center|[[Lightning Spire]] bolts are [[size]] 2 and have last collide enabled, so although they aren't destroyed on collision they normally only collide with the [[Sorceress]] once (as indicated by equipped items applying 100% [[Chance to Cast]] [[Nova]] [[When Struck]]). However, when a [[Desert Mercenary]] is close enough adjacent for a bolt to collide with both of them simultaneously, '''he''' then becomes its last target and the bolt can collide with her a second time before it is out of range.]]
 

==Next delay==
Next delay is an internal timer applied to a monster after a missile from a particular set of skills collides with it. Missiles from these skills will not collide with the monster until the timer expires. Next Delay duration is measured in frames. [https://www.mannm.org/d2library/faqtoids/nhd_eng.html]

;Skills
{{Text table}} width=67%
|-align=center
!width=33% align=left|Class
!width=34%|Skill
!width=33%|Duration in Frames
|-valign=top
![[Amazon]]
|
*[[Multiple Shot]]
*[[Strafe]]
*[[Lightning Strike]]
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*4
*4
*4
|-valign=top
![[Assassin]]
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*[[Shock Web]]
*[[Blade Sentinel]]
*[[Wake of Fire]]
*[[Claws of Thunder]]
*[[Phoenix Strike]]
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*25
*25
*4
*4
*4
|-valign=top
![[Barbarian (Diablo II)|Barbarian]]
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*[[Battle Cry]]
*[[War Cry]]
*[[Battle Orders]]
*[[Battle Command]]
*[[Grim Ward]]
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*4
*6
*4
*4
*6
|-valign=top
![[Druid (Diablo II)|Druid]]
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*[[Twister]]
*[[Tornado]]
*[[Volcano]]
*[[Shock Wave]]
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*25
*25
*10
*4
|-valign=top
![[Necromancer]]
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*[[Teeth]]
*[[Poison Nova]]
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*4
*4
|-valign=top
![[Paladin (Diablo II)|Paladin]]
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*None
|
|-valign=top
![[Sorceress]]
|
*[[Chain Lightning]]
*[[Nova]]
*[[Frost Nova]]
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*4
*4
*4
|}
 

==Speed and range==
*Distance is measured in yards, while speed is measured in yards per second. In this case, a yard is defined as the distance between opposite corners of a sub-tile [https://www.theamazonbasin.com/forums/index.php?/forums/topic/122557-clarification-of-movement-speed/], into which the world surface is normally invisibly divided, like a chess board: a yard measures 32 pixels horizontally and 16 pixels vertically due to the game's [https://en.wikipedia.org/wiki/Isometric_graphics_in_video_games isometric graphics].

[[File:Sub-tile.png|center|thumb|400px|Enlargement of a single sub-tile.]]

*Consequently, the dimensions of the visible screen are as follows:

{{Number table}} width=33%
|-valign=top align=center
!width=33% rowspan=2|Resolution
!colspan=2|Visible Area
|-align=center
!width=34%|Pixels
!width=33%|Yards
|-align=center
|640 x 480||640 x 432||20 x 27{{0|.0}}
|-align=center
|800 x 600||800 x 552||25 x 34.5
|}

[[File:Radius.png|center|thumb|600px|Relationship between yards and [[radius]] at 800 x 600 resolution.]]

*Missile speed is specified in terms of pixels travelled each frame, so in terms of yards per second it is calculated as follows for those with constant non-zero speed:

:Missile speed = 25 * pixels / 32 [https://d2mods.info/forum/kb/viewarticle?a=364]

*Missiles only exist for a specified number of frames before expiring, so missile range in yards is calculated as follows for those with constant non-zero speed:

:Missile range = frames * pixels / 32 [https://d2mods.info/forum/kb/viewarticle?a=364]
 

==Reference==
*[https://www.theamazonbasin.com/forums/index.php?/forums/topic/86981-inferno-arctic-blast-bug/ Inferno & Arctic Blast Bug] (D2 Technical)
*Gustafsson, Tommi, [http://web.archive.org/web/20070608234103/http://users.tkk.fi/~tgustafs/mdrmod.html Magic Damage Reduction Modification vs. Frame-Based Attacks] (Internet Archive)
*Librarian, [https://www.mannm.org/d2library/faqtoids/nhd_eng.html Get it While You Can: NextHitDelay - NHD] (FAQtoids)
*Nefarius and Brother Laz, [https://d2mods.info/forum/kb/viewarticle?a=364 Missiles.txt File Guide v. 2] (Phrozen Keep)

Missile - Revision history

imported>Onderduiker: Updated links