Diablo II Expansion, patch 1.10
Initial
reports by Jarulf
Compiled by Tommi Gustafsson
Blizzard has implemented a modifier, which reduces the protective effect of Magic Damage Reduced by X (MDR) against certain continuous attacks (i.e. frame-based attacks), such as Firewall. Blizzard apparently thought that MDR was too powerful against frame-based attacks, and consequently, they reduced its effect as if it was applied once each second instead of once each frame. In many cases, this means that the effect MDR is effectively cut to one-25th. The attacks listed in the table below have MDR modifiers.
MDR Modifiers
Attack MDR Modifier* MPQ Name Arctic Blast, Druid 1/25
ArcticBlast1 Armageddon Fire, Druid 1/25
ArmageddonFire Armageddon Fire, Diablo 1/25
DiabloGeddonFire Fire Cloud, Viper 1/25
Viper_FireCloud Firestorm, Diablo (twisting fire lines) 1/25
DiabWall Firestorm, Druid 1/25
FireStorm Firewall, Countess 1/25
CountessFirewall Firewall, Sorceress 1/25
Firewall Firewall, Vampire 1/25
VampireFirewall Immolation Arrow Fire, Amazon 1/25
ImmolationFire Inferno, Megademon 2/25
MegademonInferno Inferno, Fetish 2/25
FetishInferno1 Inferno, Sorceress 2/25
InfernoFlame1 Lightning Breath of Death, Diablo 2/25
DiabLight Meteor Fire, Catapult 1/25
CapapultMeteorFire Meteor Fire, Sorceress 1/25
MeteorFire Meteor Fire, Vampire 1/25
VampireMeteorFire Molten Boulder Fire, Druid 1/25
MoltenBoulderFirePath Wake of Fire, Assassin 5/25
Wake of Destruction maker, Wake of Destruction Wake of Inferno, Assassin 2/25
Inferno Sentry 1 *) Due to precision, 1/25 is actually 41/1024. Similarly 2/25 is really 82/1024, etc.
The damage of firewall attacks is dealt by three flames that hit the target at the same time. Each flame is a separate attack and hence MDR is applied 3 times. Thus, MDR effectively functions at triple normal power against firewalls.
Adamantine for pointing out that FetishInferno2, etc. are not used by the game.
Ruvanal for listing changes from 1.09 to 1.10.