セフィロス
Skeletron Prime
Mod browser has a Mod ´that adds already a additional Acc slot to the existing Demon heart, with the Nature heart from Plantera.It would be interesting if there was a mod that gave you extra inventory space, and other mods that add more accessory slots like the wing slot mod.
But the Original Mod Autor of this mod didnt updated it to 1.3.4 a fan did it sinc ethe original autor is afk.
But Raritrin is working on a mod to give even more acc slots. And yes i wish we had also some Inventory exapnding Acc specialy for early exploration.