Pro

In game description- "Raises the base level of all skills. Start out stronger!"

This is an ability usable by everyone.

Since it is an auto-skill it activates automatically without any MP nor button pushing.

At the Mojo-Dojo you may increase it's LV which makes it more powerful.

Since it is an auto-ability you may equip 4 total.

Making the right 4 for a character or specific map can be crucial for the gameplay.

Since it boosts the base level of all your skills, you can start of which stronger abilities initially.

If you have a spare slot then this is a great one to have.

Like Excel this is a good LV booster for skills.