Nest Sphere
Eren didn't give Michael much time to decide if the Origin Sap was worth a favor and some Soultraits. He flicked his wrist, and a purple sphere appeared before him.
The sphere expanded rapidly and transformed into a mass of energy, not unlike a Summoning Gate's energy pool. The only visible differences were the color – the mass of energy before them being purple – and energy density. The energy before him was incredibly dense and oddly stable, given that it appeared out of nowhere.
"A portal straight to the Nest," Eren announced, not even trying to hide his vibrant smile.
"If you can create portals like that, why do you have to create a bridge to this galaxy?" Michael asked, activating Spirit Eyes to inspect the portal in detail.
Cosmic Stride and the Spatial Elemental Sphere granted him a better understanding of everything related to space. That included the massive pool of energy before him.