A mech suit is an 8-foot tall suit of robotic powered armor that can be climbed into by a small sized creature.

Powered Armor. The weight of the mech suit does not contribute towards your encumbrance. Furthermore, while you are wearing the armor, your Strength score changes to 25 if it is not already higher. Additionally, your walking speed changes to 60 feet if it is not already higher, and you gain a jumping speed of 60 feet.

Medium. While inside of the suit you count as a medium creature.

Life Support. The mech suit has a 96-hour self-contained air supply. While you are wearing it, you have resistance to fire and cold damage, however you are vulnerable to lightning damage. 

Mech-Fist. While you are wearing the mech suit, you can roll 2d8 in place of the damage of your unarmed strikes.

Sensors. While you are wearing the mech suit, you can see in dim light or darkness within 600 feet of you as if it were bright light.

Integral Weaponry. The mech suit is equipped with bludgeoning and force based ranged weapons.

Force Blast. As an action you may choose to fire a concussive blast from the arm of the suit at a point you choose within range, which then erupts with a sonic boom into a wave of force. Each creature within a 10-foot-radius sphere centered on that point must make a Strength saving throw. A creature takes 6d6 force damage and is knocked prone on a failed save. A creature that succeeds on its saving throw takes half the damage and isn't knocked prone.

This can be used twice per long rest, range is 60 feet.

 Concussive Projectile. The fists of the mech suit may be fired from the suit as ranged projectiles to deal 4d8 bludgeoning damage to a single target within range. A full action must be taken to reattach the fist before firing again.

Plate consists of shaped, interlocking metal plates to cover the entire body. A suit of plate includes gauntlets, heavy leather boots, a visored helmet, and thick layers of padding underneath the armor. Buckles and straps distribute the weight over the body.

Notes: Bonus: Strength Score, Resistance: Cold, Resistance: Fire, Vulnerability: Lightning, Sense: Darkvision, linking soul gems energy to operate., Str. 15 Required, Stealth Disadvantage