The last time they visited this dungeon, just as they were leaving it was ranking up from orange to yellow and now it had just ranked up to green.
The instant that they stepped inside the dungeon the changes were instantly noticeable. The temperature had to be at least 190 degrees Fahrenheit. Luckily rankers' bodies were much more resilient to the elements than regular humans or dying from heatstroke, heat exhaustion or dehydration would kill them before the Hellhounds did.
It was also several times larger than when it was yellow core ranked. The burned trees were taller, thicker and there were many more of them. In fact, there were so many that it looked like an actual thick forest even though the trees were all bare. You were no longer able to see the portal that the Hellhounds came out of.