As you are home you put on one of the crystals. Since it's on a thin leather strap you simply hang it on your neck. You start to feel it. It's very hard with moderately sharp angles, it's shaped like a prismatic rod. Comparing it to the other crystals you notice that they are almost identical, save for the different color. The one you are wearing is in a rather vibrant color of green.
By chance, or could it have been intuition, you stroke the crystal from top to bottom. Suddenly a flash of light engulfed you. Suddenly you seem to grow a bit in size getting bulkier, or at least that's what your clothes do, after what felt like seconds you find yourself in a whole new different kind of outfit.
First thing you notice is that you are wearing some sort of helmet which covers your face. As you get up to get to the nearest full-sized mirror you notice that you are now also wearing gloves and boots. As you reach the mirror you are finally able to get a good look at yourself.
What looks back at you could be a space man. You clearly wear some sort of space suit. However unlike any you have seen before, tis one was made to impress. It looked like it was made out of leather and green painted metal armor, lots of armor for that matter making you almost look like a robot. On your front there is a pair of rows of what appears to be golden buttons, giving you a rather maritime captain look. This is only amplified by your helmet having a rather triangular shape on top, making it look like a tri corner hat. On your back you notice some sort of jet pack, and most unusually there is a cutlass hanging from what appears to be a belt. Then you notice that logo on your breast plate being a jolly rogers. You look like what could probably be best described as a space pirate. The visor of your helmet somehow shows a pair of menacing glowing stylized eyes and as you flip it open a strangers face looks back at you.
Dumbstruck by the strange situation, you stare at it when it suddenly started to move and speak on its own. "What shit hole did I get to his time?", your mouth said by itself. "Hey you, who are you?", it scoffed at you, continuing "I'm so gonna fwlwlwllwllw". It was cut short as you were trying to move your tongue on your own, finding it remarkably easy. Sensing that you have the upper hand, you start to think about this foreign presence and somehow start to understand how you can control him. Extorting some moderate force of pressure you start inquiring him, "Now listen, who are you?".
The foreign entity responded, having no choice, "I'm Zaldor or Quarf. Space Pirate and scourge of the seven interstellar voids." He sighed, "I've been banished into this form for my crimes against the galaxy, and now I'm a mere puppet or whoever activates me."
Somehow you are able to probe into Zaldor's mind and feel his repent. He was in a bit of a pickle, once one of the most powerful beings of his galaxy, how subject to your whims. You somehow feel sorry for him. Looking at your chest you notice that the crystal appears to have gone. However your intuition tells you that you can change back by either putting Zaldor back into his crystal or temporarily giving him back his body for a short amount of time.