'The skill compression has been learned through the actions of the user. This skill is unique to very specific systems. There are only five that currently hold this skill with the description it has in this instance.
Compression- mana cost is not applicable
This skill is not the normal compression skill known by some beasts that compresses their size temporarily or compresses muscles. This is a skill that relies on the understanding of skills and the manas needed to use them.
This skill compresses skills together so that the skills will have a clearer influence. The perfect example of this is when two sword skills are compressed to make a sword style skill. While it may appear simple, the understanding of the skills needs to be very high to achieve this. It also requires the user to be able to spend the time training the produced skill as if it is a brand new skill due to the potential changes needed to be made to the use of the skill.