Do ExS Items use ExU Item IDs?
Oh, I see what’s the problem! No, they don’t, I should have mentioned this earlier. Hold on a sec, I’ll transcribe them individually.
deep dark portal: “ExtraSimple:deepPortal”
last millennium portal: “ExtraSimple:deepPortal:2”
Does the Deep Dark Portal Item exist in ExtraSimple?
Yep, it’s there in the pic on the right.