Critical hit damage
From Diablo Wiki
Critical Hit Damage (CD or ChD) determines how much damage a critical hit deals in Diablo 3. Raising this figure is a key way to increase a character's DPS, and skills and items that add to this stat are much sought after.
The base critical hit damage of a naked character is 50%, but well-equipped characters should deal at least 300% CD, and figures over 500% are not uncommon when dual-wielding in good gear.
Critical hit Chance (CC) works in tandem with CD, and is as or more important. While Critical Damage is a huge factor in a character's overall damage output, Critical Chance is as well, plus many procs trigger off of crits, and a fairly high Critical Chance is considered essential for many builds to function properly.
- Refer to the Critical hit Chance article for more details.
 Maximum Critical Hit Damage
In D3v2 and Reaper of Souls, Critical Hit Damage can be raised through Items, Paragon Points, and a few passive skill bonuses. Though higher level emeralds exist in RoS, the total CD values are smaller than they were in D3v, since weapons can no longer roll up to 100% (or 200% on two-handed weapons).
Critical hit Damage can not be found in every item slot, and slots not listed below have no items with CD. The maximum Critical Hit Damage per item slot is:
- Amulet: 100%
- Gloves: 50%
- Ring: 50% (Each ring.)
- Belt: 50% (Legendary Witching Hour only.)
- Weapon: 35% (Exarian, Monster Hunter, Nutcracker, The Barber, Unbound Bolt.
- Weapon socket: 130% Flawless Royal Emerald. (Double if dual-wielding.)
- 335% from items.
- 130% / 260% from Emeralds in sockets.
Additional CD sources:
- Character default value: 50% (A brand new level 1 with no gear has 50% CD and 5% ChC.)
- Paragon Points: 50% (1% per point, capped at 50)
- Skills: Various class skills and passives may add CD, including Archery and Wrath of the Berserker.
All told, a character could have 335% + 260% + 50% + 50% = 695% CD, not including any skill bonuses. This would require exceptional gear, though values of 550% or higher are not uncommon for the well geared dual-wielder.
Consider that dual-wielding 260% + 50% paragon points + 50% inherent is 360% without adding a single point of critical hit damage from gear. Since it's not difficult to add 150% from amulet + rings + gloves, that's 510% without any legendary gear or skill bonuses.
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