Anonymous D joined in and replied with this 15 years ago, 44 minutes later, 1 hour after the original post[^][v]#235,710
@235,694 (!hEyBrieeXM)
Normally that is how you would get to the end. That black goo is what spawns when you active the portal you saw in the stronghold.
OP just spawned the goo and went in just as one would if they spawned a portal piece for the nether.
!hEyBrieeXM replied with this 15 years ago, 2 minutes later, 1 hour after the original post[^][v]#235,711
@previous (D)
yeah, i've been through the portal i was just wondering if that stuff was generated in random places like in OPs pic.
i think when notch first showed it in a screenshot it was just in a cave.
Anonymous D replied with this 15 years ago, 5 minutes later, 1 hour after the original post[^][v]#235,715
@previous (!hEyBrieeXM)
He probably just spawned it.