MaxQuest

Well... it's from patch 1.2.0 (from 29 june 2018):
 

Consumables are no longer affected by Might, Intellect, or Perception bonuses.
So someone with 3 MIG, INT, PER is as effective as someone with 20 MIG, INT, PER at using scrolls and potions...

Dex increases your action speed.
While the tooltip displays action time decrease.
 
1 - 1 / 1.30 = 0.23

Yes. But you can turn it off by disabling cheats, if it's uncomfortable.
 
P.S. Btw, Q does exactly 1/4 max hp damage. So the mouseovered target will go from Unharmed->Healthy->Hurt->Bloodied->Dead.

With endurance at 100% soul whip should generate 83.33... per 100 points of damage. 33 from talent, 25 from Talisman of the Unconquerable, and 25 base. However, it consistently, even after reloading the game, generating about between 47.8-65.8% of damage as focus. It isn't even consistently wrong. If it was I'd just assume that the formula I am using is wrong.
Well... 
In v3.00 base focus gain (per point of damage dealt) was increased from 0.25 to 0.35.
 
0.35 * 1.33 (draining whip) = 46.55%
0.35 * 1.33 (draining whip) * 1.25 (talisman) = 58.18%
 
So you get 58.88 focus per 100 (post-DR) damage dealt (while being above 50% endurance).
 

How have you arrived to 83.33?

Nothing strange here
 
Unenchanted scale armor gives:
7 general DR
9 (i.e. 125%) vs slash and freeze
5 (i.e. 75%) vs pierce
 
Unenchanted scale armor with +3 vs Pierce gives:
7 general DR
9 (i.e. 125%) vs slash and freeze
8 (i.e. 75% from 10) vs pierce
 
Fine scale armor gives:
9 general DR
11 (i.e. 125%) vs slash and freeze
7 (i.e. 75% from 9) vs pierce
 
Fine scale armor with +3 vs Pierce gives:
9 general DR
11 (i.e. 125%) vs slash and freeze
9 (i.e. 75% from 12) vs pierce
 
That's why you see pierce DR combined with others.
 
P.S. Get a plate armor, and enchant it vs pierce as it also provides a bonus vs it

You need to go to Stalwart. To the left of ex-burned house, there will be a dead assassin. The dialog with an NPC near that corpse, will unlock the Mowrghek Ien. You can check here for extra details.