This power allows you to sense invisible creatures around you, as long as you have at least as many ranks in this power as they have in their invisibility power. In addition, you gain the ability to sense the aura of death - every time a player kills a monster within 500 feet, plus 5 feet for every monster they've killed the current day, plus 25 feet per rank you have in this power, you will be able to sense their approximate distance and direction. You will also sense the approximate direction (but not distance) of kills made at up to three times that range.
Your reflexes and reactions also increase to superhuman levels, giving +2 Speed and +1 Speed Cap per rank. At rank 20, while your action points are at 66% or above, all techiques with a delay of 4+ seconds will have that delay reduced by 1 second. At rank 30 your action points only need to be at 33% or above, and techniques with a delay of 3 seconds will also have their delay reduced by 1.
This power also gives you access to the 'scent' command, which has the same range as your death/power sense, and will reveal the approximate distance and direction of the nearest creature within range. Every 10 ranks will allow you to sense an additional creature (eg at rank 20 you can sense the nearest 3).