Fade is the skill that makes an assassin translucent. It's an amazing skill for three reasons;
 | | It provides resistances. |
 | | It reduces the durations of curses. |
 | | It provides physical damage reduction. |
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Curse length reduction is priceless, I think anyone will know why; you can't get rid of curses like life-tap, iron-maiden, amplify damage or lower resists fast enough.
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Fade grants 1% DR each level; a level 20 fade (whether this level is obtained by spending skill points on fade or due to +skills does not matter) will add an addition 20% DR to any DR you might already have (or not). Fade's level is only important when you cast it, that means you can prebuff fade to reach the maximum of 50% DR when you duell.
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Determining the amount of skill points you need to spend on fade to obtain 50% DR is easy;
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Base Fade level = 50 - (DR from gear + skills from gear); |
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Lets say you are using the following gear:
 | | Shako |
 | | Enigma |
 | | Arachnid's Mesh |
 | | Trang Ouls Claws |
 | | Gore Riders |
 | | Mara's, 2x Raven Frost |
 | | 9x Shadow skillers. Torch, Annihilus. |
 | | CTA, Lidless, Battle Command |
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DR from gear | = | 10 (Shako) + 8 (Enigma) | = | 18 |
Skills from gear | = | 2 (Shako) + 2 (Enigma) + 1 (Arachnid) + 2 (Mara's) + 13 (Inventory) + 1 (CTA) + 1 (Lidless) + 1 (Battle Command) |
| = | 23 |
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Base Fade level = 50 - (18+23) = 50 - 41 = 9.
So, with that setup, you'd have to spend 9 points on fade and cast it with your CTA switch while Battle Command is active to reach 50% DR.
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