You also gain proficiency in the nature and survival skills You may also choose two druid cantrips and add them to your cantrips known

Evolved Companion

You gain a beast creature with a cr no greater than 1/4th as a companion, excluding anything of size large or above at this point. In addition to its base capabilities, it can gradually mutate gaining new abilities as it ages. It acts directly after your own initiative, taking orders as a bonus from you. If you are unconscious it defends you as best it can. If defeated, it requires 25 gp worth of materials and an hours worth of time to revive. In addition to this, your beast gains an additional hit die for each level you gain after 2nd. Whenever you gain the ability score increase feature, it gains an ability increase as well, following the same rules.

Your research upon it, as well as experimentation, has also yeilded an unexpected result. You've discovered how to effect the base essence of the creature, and grant it mutations. It gains one mutation from the basic category.

It shares your proficiency increases as well, at 5th, 9th, 13th, and 17th level, which are added to it's hit score and skill bonuses

You may choose 2 proficiencies for it's saving throws.