Sentries Vigil. The Warframe cannot sleep and cannot be put to sleep by any means.

Adaptive Defense. When the Warframe is hit by an attack, it's Armor Class becomes the number rolled on the attack die, unless that attack was a Critical Hit. 

Multiattack. The Warframe makes two longsword or two longbow attacks. 

Longsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (1d10 + 3) or 10 (1d12+3) (versatile) slashing damage. 

Longbow. Ranged Weapon Attack: +6 to hit, range 120/300 ft., one target. Hit: 10 (1d12 + 3) piercing damage.

Sweeping Strike. (Recharge 5-6) Each creature within 5 feet of the Warframe makes a DC 15 Dexterity Saving Throw, taking 2d8 Slashing damage on a failed save, or half as much damage on a successful one. 

Adaptive Body (optional). When the Warframe is hit by an attack, it can use it's reaction to gain resistance to that damage type until the start of it's next turn.