Cacterian Oasis Mage

Thorny Body. The Cacterian's body is covered in prickly spines. When a creature makes contact with it, these spines break off into their skin, causing them to take 1 (1d4-1) piercing damage.

Stalwart. The Cacterian has advantage on saving throws made to avoid Exhaustion. 

Speak with Animals and Plants. The Cacterian can speak to small animals and plants as though they share a language.

Oasis Regeneration. If the Cacterian is within 15 ft. of a body of water at the start of its turn, it regains 4 (1d8) hit points.

Spellcasting. The Cacterian is a 6th level spellcaster. The Cacterian's spellcasting ability modifier is Wisdom (spell save DC 14, +6 to hit with spell attack rolls). The Cacterian has the following spells prepared:
(at will): Druidcraft, Gust, Mold Earth, Shillelagh
(4 spell slots): Color Spray, Create or Destroy Water, Earth Tremor, Goodberry
(3 spell slots): Dust Devil, Spike Growth, Maximillian's Earthen Grasp
(2 spell slots): Create Food and Water, Daylight, Plant Growth

Multiattack. The Cacterian makes 2 Projectile Spine attacks, or 1 Projectile Spine attack and casts a cantrip.

Slam. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 2 (1d4) bludgeoning damage, plus 1 piercing damage. 

Projectile Spine. Ranged Weapon Attack: +3 to hit, range 15/60 ft., 1 target. Hit: 2 (1d4 + 1) piercing damage.