When looking into unique monster mechanics in Diablo II: Resurrected, players often wonder why Amplify Damage from a 'Cursed' minion seems slow to trigger in 1v1 situations, yet melts physical immune monsters in dense packs.

Game data (monumod.txt) provides the exact mathematical reasoning behind this mechanic.

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1. The 5% Proc Chance and How Hit Frequency Works

In monumod.txt, the Cursed affix is defined as a 5% chance to cast Level 5 Amplify Damage on striking or being struck.

• Single Target Melee: At 5%, you need on average 20 basic attacks for one proc.
• Inferno Flame Breath: Frame-by-frame hit detection generates multiple chances per second, proccing Amplify Damage almost immediately.
• Holy Freeze / Thorns Pulse: Pulsing damage across 8-12 nearby monsters rolls independent 5% checks simultaneously.

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2. Amplify Damage vs. Physical Immunity Calculation

When casting Amplify Damage on a naturally Physical Immune monster (Physical Resistance 100%+):

• Without Sunder Charms: The curse effectiveness is reduced to 1/5th (-20% physical resistance), leaving the monster at 80% resistance.
• With Bone Break Sunder Charm: The monster's base resistance is set to 95%, allowing Amplify Damage to reduce it to -5%, dealing over 200% increased damage.

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3. Top 3 Practical Setups to Spread Curses

1. Act 4 Venom Lord Inferno Breath: Range 30 flame cone rapidly blankets packs in Amplify Damage.
2. Act 1 Edge Rogue (Thorns Aura): When the cursed minion is struck in a pack, thorns reflection procs Amplify Damage right back onto the attackers.
3. Holy Freeze Unique Demon: Slows incoming enemies while pulse rolls trigger the curse automatically.

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4. Guaranteed 'Cursed' Named Demons

• Act 3 Travincal — Ismail Vilehand (Council Member): Extra Fast + Cursed (with Zakarum Heal).
• Act 4 Plains of Despair — Darkwing: Extra Strong + Cursed (Flying bat demon).
• Act 4 River of Flame — Hephasto the Armorer: High base HP (760) makes him the premier tank if Cursed rolls.

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Summary