This skill is extremely hard to learn.
The skill takes some time to use.
You can autonomously learn more about this skill.
To know your foe before you try and die is an obivious advantage to any character. Sometimes tiny creatures without visible muscles are the deadliest opponents one can find, and with this skill you can spot those little tips that tell you what your opponent really is. You should always remember that just by looking something you cannot tell anything about your foe except the weapons and/or armour it uses, if any. The better the knowledge in this skill, the better the results achieved.