Ranger: Level 3, Wyvern Rider Conclave, ID:227910

Wyvern Companion

At 3th level, you gain a Wyvern which gains a variety of benefits while it is linked to you.  

• The wyvern has double hit points from it's normal calculation.
• The wyvern loses its Multi-attack action if it has one.
• The wyvern obeys your commands as best it can. It doesn't roll for initiative and goes directly before or after you, but you determine its actions, decisions, attitudes, and so on. If you are incapacitated or absent, your wyvern acts on its own.
• Your wyvern uses your proficiency bonus rather than its own for attacks and skills which it is proficient in.
• An wyvern also adds your proficiency bonus to its AC and to its damage rolls.
• Your wyvern gains proficiency in two skills of your choice.
• It also becomes proficient with all saving throws.
• For each level you gain after 3rd, your wyvern gains an additional hit die and increases its hit points accordingly.
• Whenever your Wyvern is not with you in combat, you gain an additional damage dice on every attack.

Whenever you gain the Ability Score Improvement class feature, your wyvern's abilities also improve. Your wyvern can increase one ability score of your choice by 2, or it can increase two ability scores of your choice by 1. Your wyvern can't increase an ability score above 24 using this feature unless its description specifies otherwise.
Ranger specific abilities:

• When using your Natural Explorer feature, you and your wyvern can both move stealthily at a normal pace.
• Your Wyvern gains the bonuses from your Favored Enemy ability