Helmet of the Dino Slayer

Wondrous item, rare (requires attunement)
  This Helmet is made from various dinosaur parts by an expert craftsman. It offers protection against otherwise deadly blows from creatures larger than you. Wearing such a helmet is proof of superior hunting and survival skills in the deadly jungle. While wearing this helmet you have advantage on intimidation checks.
  Saurian Resilience. When a creature one or more size categories larger than you reduces you to 0 hit points with a melee weapon attack, make a DC 13 Constitution saving throw. On a successful save, you instead drop to 1 hit point. Success or fail, this property can’t be used again until you finish a long rest.
  One With Nature. You have mastered survival in hostile jungles. While wearing this helm, you can cast the animal friendship, speak with animals, and locate animals or plants spells from it, using Wisdom as your spellcasting ability. Once you cast any of the spells, you can’t use this property again until you finish a short or long rest.