The Sandevistan is an implant that must be grafted into the spine starting at the based of the neck, down to the middle of the back with a DC 25 medicine check. If the check is failed by a difference of 8, the grafting fails but the recipient is stable. Failing by a difference greater than 8 causes the recipient rapid blood loss, and a permanent -1 to all dexterity rolls. 

Should the grafting succeed, the recipient and anything currently being carried or worn by them, including other creatures, gain access to super speed, as long as their body can handle it. As a free action or a reaction, the sandevistan can be activated, granting the user the ability to take 2 additional turns consecutively and avoiding all current attacks directed at them. During these turns, difficult terrain is ignored, acrobatics and stealth checks are successful, and all attacks made by the user are critical hits. If the user is carrying a creature, that creature does not receive the benefits of the Sandevistan. If another creature is equipped with one, it can activate as a reaction it to receive the same effects, negating the critical hits and automatic success on stealth checks for both of them, and becoming able to follow the other creature's movements as if it were real time. 

After the effect ends, the user gains a level of exhaustion based on their constitution, as follows:

• -3 or lower causes instant death
• -2 or -1 applies 4 levels of exhaustion
• 0-1 applies 3 levels of exhaustion
• 2-3 applies 2 levels of exhaustion
• 4-5 applies 1 level  of exhaustion