Hi everyone,
So I'm new to this forum and just wanted to share my research on how Stamina scales with weapon skill damage.
As we know, Stamina increases a skills damage but NOT the weapon damage. But I wanted to know how much stamina was really impacting our skills.
Details about test and character:
Nightblade Khajit at Vet3
Base Stamina with NO Stamina buffs : 1200
Additional Stamina Values are at the top with 0,70,64,66...200,306,506
Weapon damage: Bow at 103 wep dmg and 1 entry at lethal arrow with 136 dmg.
Format for skills: name(skill rank), all skill names are correct and include morph versions for those morphed (Mainly bow and dual wield)
I did not include skill that did not have any damage trait like Defensive posture under one hand shield as well as Sparks in Dual Wield.
Values with commas indicate multiple damage/heal values in the order they are listed in the skill description.
Example: Blood craze hits for
73, bleeds for
310, heals for
41. Cell value will then be
73,310,41
I removed "per second" or time values because they were never affected by stamina.

Interesting observations:
-Looking at Blood Craze for 130 and 134 stamina, strike damage does not change but bleed damage increases by 5 from only a 4 stamina difference. However, 64 and 66 stamina increase show no change for blood craze. This indicates a possible threshold that stamina needs to break in order some effects to get an increase rather than a per stamina increase.
-Different skill damages increase at different rate. This shows that, for example, 70 stamina increase may result in a 3 damage increase but this does not mean that ~70 stamina will increase all skill damage by 3. Example being Cleave and Uppercut. Cleave getting 3 damage increase with 70 stamina but uppercut getting 10.
- it appears that higher skill base damage results in higher scaling of damage increase from stamina increase. With the case of Cleave and Uppercut above, as well as looking at any lower base damage skills like Volly and Blinding Flurry. Flurry being a great comparison in itself.
- It seems that per skill, stamina increase and damage increase in linear. This means that every X amount of stamina will result in the same amount of damage increase for that skill only. Looking at cleave, 70 stamina increase results in 3 damage increase. At 200, 10 stamina short of being 3x 70 stamina increase, cleaves damage increases by 9 from the base value.
-Another big difference is the 33 weapon damage increase, the last entry. Lethal arrow at 103 weapon damage and 306 stamina increase shows its damage being 441 where as the the additional weapon damage boosts its damage by 59. The damage increase from stamina between weapon damages remains the same at 34.
- Weapon damage clearly increases a skills damage much greater than stamina. From the last example, 33 weapon damage change results in a 59 damage increase in lethal arrow. From a 306 stamina increase, lethal arrows damage increases by 52. Thats about 31 attribute points, or a stamina food items (at least level 45), or a couple armor pieces with an stamina enchant, invested in stamina to be shy of a 33 weapon damage increase. Clearly investing 31 stamina points would be a waste, but some food or armor enchants (even some jewelry) can be of decent help.
From my analysis, I would probably focus more on weapon damage to increase the damage output. At late game (vet 10-12) Weapon damage jewelry gives +12 if I'm not mistaken. Giving a total of 36 weapon damage. Stamina glyphs give +85 at late game. So for an effect similar to a 33 weapon damage increase, you would need over 300 stamina, my guess around being 350. That is almost all armor enchants being stamina, which some may see as a waste. I'm not sure on how much stamina jewelry gives at vet10/12 but I dont think it'll come close to being 300 amoung the 3 accessories. Maybe around 240.
Please share your thoughts, correct my analysis where needed, or even add more to the observations.