Power means different things to different people. For a political party, it's implementing their most cherished policies; for a leadership aspirant, a chance to join the Prime Ministership merry-go-round; for a business tycoon, wiping out all competion and accumulating vast wealth; for an electrical engineer, it's the product of voltage and current; and for a motoring enthusiast, it's usually prefixed by the word "horse".
But what you're seeking is someone with the ultimate power; the power over life and death. To find that being, you'll need the power of light to dispel the darkness in which he dwells.
Please don't try to remove him from his home, as he's quite attached to it; the log can be easily accessed in-situ under his robe.
As you approach GZ, heed that those who succeed in their quest for power don't take shortcuts, as doing so will lead to an impasse; rather they follow the one true path even if it means going the long way around.
The listed coordinates will bring you to the cave's mouth, with no bush-bashing or rock-climbing needed if you hold to the path; after that you're on your own. Remember, fortune (and power) favour the brave, so good luck and don't forget your light.
Congratulations to crash2079, the first to overpower the lord of darkness.