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→Double Fill Potions: The info on this page was wrong all this time...double-checked the formula in Excel and Wolfram Alpha
that works out to (Vit/4 = % double heal). To figure your odds for Mana Potions, just substitute your Energy for Vitality in the equation, they are exactly the same in other respects. Simplified, this is .25% chance per stat point, or 1% per 4 stat points, or 5% per 20 stat points.
This holds true up to 200 points in Energy or Vitality. Above 200 your % chance actually decreases with additional points in the statis affected by diminishing returns, to the tune of this formula:
[Vit^2/4]/Vit - [(Vit - 200)^2/4]/Vit
This yields a geometric curve, rather than a constant decreaseworks out to [(Vit - ((Vit - 200)^2) / Vit) / 4 = % double heal]. Check the stats in the table below for a few sample values. Most characters would much prefer more points in mana or life to a better % chance of a potion doubling, so this isn't really a trade off, but it's interesting to know.
{|
! Points in Energy<br /> or Vitality! Percent chance<br /> Chance of doubling! Energy or Vitality! Chance of doubling! Energy or Vitality! Chance of doubling
|-
| 20
| 5.0%
| 220
| 54.5%
| 420
| 76.2%
|-
| 40
| 10.0%
| 240
| 58.3%
| 440
| 77.3%
|-
| 6560
| 15.0%
| 260
| 61.5%
| 460
| 78.3%
|-
| 80
| 20.0%
| 280
| 64.3%
| 480
| 79.2%
|-
| 100
| 25.0%
| 300
| 66.7%
| 500
| 80.0%
|-
| 120
| 30.0%
| 320
| 68.8%
| 520
| 80.8%
|-
| 140
| 35.0%
| 340
| 70.6%
| 540
| 81.5%
|-
| 160
| 40.0%
| 360
| 72.2%
| 560
| 82.1%
|-
| 180
| 45.0%
| 380
| 73.7%
| 580
| 82.8%
|-
| 200
| 50.0%
|-400| 220| 45.45%|-| 240| 41.7%|-| 260| 38.5%|-| 280| 3575.70%|-| 300600| 3383.3%
|}
