It's quite simple:
Take a power icon from here.
Create a power description and some stats based off of that.
EDIT: If you're feeling more adventurous, try using a non-power icon!Pray for Mercy
You get down on your knees and beg for your life. Has a 50% chance to cause enemies to ignore you, and a 50% chance to cause the next single-target attack that hits you to kill you instantly, since it leaves you prone.Sneeze
Turning this toggle on gives you allergies. Getting hit with toxic damage and/or standing next to trees will cause you to sneeze, doing 120 toxic damage to targets in a 10 foot cone in front of you.Lumberjack
Offense Passive: Increases slashing damage, and allows you to gather 'lumber' stacks by using single-blade attacks. These stacks will allow you to use "Build cabin" and "Make a dam" abilities at a 0 energy cost.Carpal Tunnel Syndrome
Using this ability will enduce carpal tunnel syndrome in your target, making it difficult for them to type. Used against players, they will take 20 crushing damage for each letter they type into the chat bar. Against other enemies, they will take 20 crushing damage whenever they attempt to attack or heal.
How to block a user with μblock: