It's hard to tell whether this is an issue with the game, misinformation on the wiki, or me being extremely unlucky, so I'm posting here first for clarification.
Name: a sludge spiderling
Location: Qeynos Sewers
Server: Blue
Info:
https://wiki.project1999.com/A_sludge_spiderling
Having spent some time leveling in the sewers, I found it odd that I had never seen this spider, even though it was said to show up in "various" locations. After failing to get it to spawn by killing a variety of mobs, I decided to check on Youtube if anyone else had evidence of it. I gave up looking after scanning through stream number 10. Finally, on the screenshot on the wiki, the "Clan Silvermoon" watermark seems to imply that it is from Allakhazam or similar, rather than from Project 1999. Because of this, there doesn't appear to be any concrete evidence I can find of this spiderling existing on the server, aside from the wiki page itself.