https://spittfireart.tumblr.com/ shows they moved to http://nightcreepmax.tumblr.com, which shows they moved to http://nightcreepx.tumblr.com. Their linktree (https://linktr.ee/night.creep) shows a pretty even split between nightcreep and nightcreepx, but Night Creep is what appears on page titles and watermarks.

I initially tried to do this as a BUR, but it tossed an error and wouldn't allow me to post. I'm assuming due to the existing aliases on spittfire_(artist). I haven't done enough with BURs to know my way around this issue.

was the BUR I attempted.

That would require a multi-step BUR:

unalias spittfireart -> spittfire_(artist)
unalias spittfire -> spittfire_(artist)

Comment about "Post BUR":

alias spittfireart -> night_creep
alias spittfire -> night_creep
alias spittfire_(artist) -> night_creep
alias nightcreepmax -> night_creep

The bulk update request #2893 has been rejected.

remove alias spittfireart (0) -> spittfire_(artist) (0)
remove alias spittfire (0) -> spittfire_(artist) (0)

Reason: "Post BUR":

alias spittfireart -> night_creep
alias spittfire -> night_creep
alias spittfire_(artist) -> night_creep
alias nightcreepmax -> night_creep

EDIT: The bulk update request #2893 (forum #340460) has been rejected by @bitWolfy.

riverinadryland said:
remove alias spittfireart (0) -> spittfire_(artist) (153)
remove alias spittfire (0) -> spittfire_(artist) (153)

There's also a pending alias in topic #34022, which makes this whole thing a tangled mess.
I'm just gonna approve that one, then create an alias to night_creep separately and hope it'll work.

The bulk update request #2893 (forum #340460) has been rejected by @bitWolfy.

The tag alias nightcreepmax -> night_creep has been approved by @bitWolfy.