I know this is a new item and I'm going to assume its still a WIP. Buttttt. Can anyone clarify where you're meant to click on the end portal (in the end). I have tried all I can think of. But maybe its just broken? I don't know. Just spits the "Must be placed on the end gateway." message.

maybe the portal in the overworld

I've tried the overworld portal, the return portal, the island portals. I'm sure I'm just misclicking something.

ok then i have no clue

Place it where the egg usually spawns once defeating the dragon.

Hmm... what are the coords of the end portal in the end? Also is it still made out of bedrock? (Just checking mods have not changed things)

Playing SF3.

Standing on the pillar of the portal X:0 Y:0 Z:49. It's bedrock. And the first egg spawned on the top.

Ahh it should be around 0, 67, 0. Sounds like sky factory is moving the end portal...

Ahh, its no biggie for me, automated killing the dragon with mobGriefing off instead. Get a heart and egg that way.

So just to confirm this item doesn't work in SF3?

it does not

ok just tried this on the newest 3.0.15 version, haven't tried on the others but to use this item u have to make a platform i used end stone for the enderman to spawn because its like the power (sacrifice) for it to work and u can set the ender energy manipulator on the rim on the portal like where u set the crystals to respawn the end dragon, or at the top middle, either one works, then just wait for it to kill a lot of ender men ( i guess around 100) does it pretty fast and then the dragon will come down and lay the egg as a item on the ground to pick up and repeat.