Total character defense calculation

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Arionic
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Does any know how total character defense is calculated? If it a base additive of all gear defense, multiplied by gear (increases total defense) and spell stats?

Asking for a friend.

We put on Arkaines Valor and the values for vitality are a bit interesting.
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Glamdring26
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The tcd on arkanies valor is the not your "Total" character defense(afaik), but the amount of "total character defense" mods on your character. You can check this amount by using d2stats.
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Arionic
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Glamdring26 wrote:The tcd on arkanies valor is the not your "Total" character defense(afaik), but the amount of "total character defense" mods on your character. You can check this amount by using d2stats.
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That makes sense. Interesting. So you want to aim for more Character defense mods. Does it work with total defense skills I wonder?
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Glamdring26
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It should work since it gives the same stat. Like deathlord morph for melee necro.
Arionic
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Damn, I'm still stumped on how it's calculated though. It appears that when I add/remove vitality, the TCD goes up. Vitality + the TCD mod