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During the time when Shin was battling with Rhaba, Lawless and the others were having a very hard time dealing with the things on their side. Yes things, it was because they were currently being surrounded by undead monsters that have a countless number.
What's more, these undeads are not your average undead monsters that the ordinary players knew. These undead monsters were almost the same as the ones that were on Shin's side. And yes almost, these undead monsters are almost the same because the one that were on this side are much more powerful than the other side.
The most ordinary undead monsters here were as strong as the High-Ranking Undeads that Rhaba had summoned during his first appearance and before battling Shin. What's more, they were also able grow in battle just like the ones that were summoned by the Undead Rising Formation. And to make the matter worst, there are even more powerful monsters than the 'regular' ones.