You feel odd as your changes finish by adding a sharp covering over your mouth.
You look at yourself and try to focus. Okay, you're an 8' tall scorpion man with too many appendages and an odd tail. If you hadn't been able to feel it yourself you would have gotten your sister to drive you to the insane asylum (though you're still not anywhere close to being convinced that you still don't need to be.)
You decide to test your new form and sneak out the back door. You live in the outskirts of the suburbs with thick woodland behind your house so you're not afraid of being seen.
You decide to start your test with your legs just to keep it simple. You begin running and even though your body feels off balance you can run faster than you ever thought posible as a human.
Next you tried your original arms and found them surprisingly strong even considering how big they were.
Then you decided to test how well you could climb. Coming to a tree you grab onto it with every appendage except your tail and claws and begin to climb. You soon realize that you don't even have to grip the tree as your limbs now have some kind of texture that keeps them from slipping.
You climb back down and think. All you have left to test are your claws and tail. You decide to test your claws first deciding that you would rather save your tail for last. You put your pincer around a tree trunk and easily chopped it in half. You decided that wasn't enough of a challenge and grabbed a large boulder with your other pincer and crushed it in your grip.
Finally it was time for you to test your tail. You performed various activities to examine it's flexibility and strength and quickly realized that it was stronger than any other appendage. You could use it as a powerful club or wrap around an object and crush without even using your spine which actually looked more like an actually blade on one side.
You tested the spine first by forcing it deep within a rock, then using the blade-like surface to cut down a tree, which gave you a little bit of a shock as the tree suddenly fell towards you but luckily your tail reacted instinctively to push it away from you.
This is when you realized that your tail was even longer than it had been and you realized it had actually stretched when it saved you from the tree.
You decided to test this ability and found that it could stretch up to roughly 10 times its length before contracting. You tried the same with your arms and they did the same. What was really amazing about it was how they could stretch and still maintain their strength, no matter how far.
Feeling content with your abilities you decide to relax in the shade. You wonder how you are going to explain this to your sister and the sight of her eyes popping out didn't seem too far off the money.