Bestiary of Beast Summoning

You are a specialist in observation and learning of the creatures you have fought and slain, able to pick up on weaknesses and make note of them when in the heat of battle, remembering this for later reference. You gain the following benefits:

• Increase your Intelligence score by 1, to a maximum of 20.
• Increase your Strength score by 1, to a maximum of 20.
• Whenever a creature dies within 60 feet of you, you can use your reaction to make an Intelligence (investigation) check, the DC equalling 10 + the creature’s Challenge Rating (above 1/2). On a success, you gain the opportunity to heal the creature and make it your Beast Companion. You may replace your beast companion by following the same steps on a different animal. On doing this, your original connection to a beast dissipates causing the beast to flee into the wild.
  The beast obeys your commands as best as it can. It takes its turn on your initiative. On your turn, you can verbally command the beast where to move (no action required by you).
  You can use your action to verbally command it to take the Attack, Dash, Disengage, or Help action. If you don’t issue a command, the beast takes the Dodge action.
  If you are incapacitated or absent, the beast acts on its own, focusing on protecting you and itself. The beast never requires your command to use its reaction, such as when making an opportunity attack.
  If the beast dies, it cannot be revived to become your companion again.