The vidya is the character that basically serves to heal others. Levean not alone, so they need a party. It is full vitality and when it reaches the top, agility.
Vidya full life:
This pj is the hardest to leveling because you can not kill almost anything just so you always have to go party, if you have claws can kill more monsters refined but it takes centuries. This pj is very useful to kill or do Bozez areas because they can heal and give aura to all party members, not to say that if any unexpected drop revives you in a moment.