Here goes...

Skill: Defensive Insight
This skill will provide you with a complete understanding of advanced
defensive manoeuvrings. Even the most talented soldier will find these
teachers hard to grasp, and almost impossible to master.
Defensive Insight can be improved by using total defence on monsters. However,
bungling of total defense will result in critical hits, the number of hits
decided by how bad the error was and how big the monster is.

Skill: Total Defense
Makes dodge and parry 50% more effective for a short period of time (30 secs?
dependant on % in defensive insight and dex/str?), the ep used will increase
as % in defensive insight increases.

Moss.