The one inside the Deku Tree is story-relevant, so I wouldn't be surprised if that one was specifically programmed to NOT respawn. It would be weird for the Deku Tree to fall ill over and over again just because the sentient ulcer inside of him frequently reappears.

All others I've found so far seem to regularily respawn tho. If you want to know where their locations are, you can use this map and just scroll all the way down to the "Gloom Spawn" button.

(IIRC it is somewhat random what equipment the Phantom Ganon carries, so it might make sense to savescum until one with a sword shows up. I'm not 100% sure aboutt he randomness tho as I usually avoid those things if I can help it.)

EDIT: It's fixed, not random.

save

path: 0 1114432 1118084 1133442, hotness: undefined, score: 2, children: 6

Bicyclejohn 2 points 3 years ago

Isn't the equipment fixed. I also saw one on the way through the korok forest depths and not in the tree. It didn't respawn either. That or I placed my pin bad

save

path: 0 1114432 1118084 1133442 1135411, hotness: undefined, score: 2, children: 5

justlookingfordragon 1 point 3 years ago

I heard it was allegedly random, but like I said; I can't really verify it as I've been avoiding these Eldritch Horrors whenever possible ^^° Might just be a rumor then. I can test it later tho if you'd want me to.

save

path: 0 1114432 1118084 1133442 1135411 1136860, hotness: undefined, score: 1, children: 4