Your explosion deals double the normal damage, 2 d6 bludgeoning damage in a fifteen foot sphere.  While you are more powerful, there is the cost of your sanity.  You attack the first creature you see,  you must make a DC 14 wisdom save to not charge at an ally.  On a fail you charge at rhe first creature you see, exploding when you are within 5 feet, on a success you can differentiate between ally and foe.

You are a monstrosity.

You are Medium.

Your walking speed is 30 feet.

You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

You can use your action to self destruct. When you use your creeper blast, each creature in the area of the explosion must make a saving throw. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 damage on a failed save as well as being pushed back 10 feet and are knocked prone, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. After you use your breath weapon, you can’t use it again until you complete a short or long rest.