Bramble Runner
Traits
Woodland Stride. Unaffected by nonmagical plant-based Difficult Terrain. Nimble Escape. Takes Disengage or Hide as a Bonus Action. Skirmisher's Advantage. If the Bramble Runner moved at least 20 feet this turn, its attacks deal +7 (2d6) extra damage.
Actions
Multiattack. Two Thorn Blade attacks. Thorn Blade. Melee Attack Roll: +6, reach 5 ft. Hit: 8 (1d8 + 4) Slashing damage. Thorn Dart. Ranged Attack Roll: +6, range 30/120 ft. Hit: 7 (1d6 + 4) Piercing damage, and the target makes a DC 13 CON save; on a failure, its Speed is reduced by 10 ft. (1 turn).
Reactions
Evasive Roll. When hit by an attack, moves half its Speed (doesn't provoke Opportunity Attacks). This doesn't cancel the attack.
Key
Area spells (it can't dodge those) and create Difficult Terrain magically (Spike Growth — Woodland Stride only bypasses nonmagical plants!).