The All-Class Spirit Mage

Fantasy + reborn + magic + monster pets. The tags are wrong.

The sacred beast White Tiger is second to none.

This is a world of spirit magic, where people study spirit magic to build cities and defend their homes!

Because of the White Tiger's sacred crystal, He Fan returns to his youth.

Everything will begin anew.

(I'm a fan of Versatile Mage, so there will be a few similarities.)