>>4171
25th anniversary party AKA when Mania and Forces were announced.
>And what exactly happened during said anniversary that made things so bad over there?
It was just the beginning of a turning point for the general. Since those games were announced, 4/sthg/ began getting more and more attention, newcomers, and traffic that lead to a change in culture and eventually attracted a lot lower quality posting.
Things like creation of a discord which some clashed with, some namefag dramas, boards fighting each other, cancellation of the Archie comics, and inheriting a major shitposter from another general were just completing the change.