“Adds a chance for poison to cloud an enemy's mind, sending them into a state of confusion.”
Notes
 Maxing this skill adds great utility to the battle and reduces the number of chances a monster will get a hit on you.
Progression
Level  Skill Potency 

1 / 8 
1 Active Energy Cost per Second
15% Chance to Fumble attacks for 3.0 Seconds
6.0% Chance of 1.8 ~ 2.4 second(s) of Confusion

2 / 8 
1 Active Energy Cost per Second
20% Chance to Fumble attacks for 3.0 Seconds
8.0% Chance of 1.8 ~ 2.8 second(s) of Confusion

3 / 8 
1 Active Energy Cost per Second
25% Chance to Fumble attacks for 3.0 Seconds
10.0% Chance of 1.8 ~ 3.2 second(s) of Confusion

4 / 8 
1 Active Energy Cost per Second
30% Chance to Fumble attacks for 3.0 Seconds
12.0% Chance of 1.8 ~ 3.5 second(s) of Confusion

5 / 8 
1 Active Energy Cost per Second
35% Chance to Fumble attacks for 3.0 Seconds
14.0% Chance of 1.8 ~ 3.9 second(s) of Confusion

6 / 8 
1 Active Energy Cost per Second
40% Chance to Fumble attacks for 3.0 Seconds
16.0% Chance of 1.8 ~ 4.3 second(s) of Confusion

7 / 8 
1 Active Energy Cost per Second
45% Chance to Fumble attacks for 3.0 Seconds
18.0% Chance of 1.8 ~ 4.6 second(s) of Confusion

8 / 8 
1 Active Energy Cost per Second
50% Chance to Fumble attacks for 3.0 Seconds
20.0% Chance of 1.8 ~ 5.0 second(s) of Confusion

Levels only acquirable through items, shrines and Battle Standard  
9 / 8 
1 Active Energy Cost per Second
55% Chance to Fumble attacks for 3.0 Seconds
22.0% Chance of 1.8 ~ 5.4 second(s) of Confusion

10 / 8 
1 Active Energy Cost per Second
60% Chance to Fumble attacks for 3.0 Seconds
24.0% Chance of 1.8 ~ 5.7 second(s) of Confusion

11 / 8 
1 Active Energy Cost per Second
65% Chance to Fumble attacks for 3.0 Seconds
26.0% Chance of 1.8 ~ 6.1 second(s) of Confusion

12 / 8 
1 Active Energy Cost per Second
70% Chance to Fumble attacks for 3.0 Seconds
28.0% Chance of 1.8 ~ 6.5 second(s) of Confusion

Excerpt form Titan Quest: Anniversary Edition changelog
 Halved chance of confusion.
Related Items
 Mistilteinn (sword)