User blog comment:The Reptile King/RP Characters Aeron Evendrak and Grimgarl/@comment-26545936-20180130030928/@comment-27950421-20180130032507

It's a homebrew class I found online. But yeah, 5e. Basically lets you have any beast, monstrosity, or elemental with challenge rating of 1/2 or lower as a companion and evolves the creature with you as you level up, however it has fewer perks that you gain as you level up and a more restricted spell list.