Another great game design is that you cannot stomp on the plates at Spider oddity in Skitter if you are in combat. The flame aura is very useful if you want to do the Festering Timelines achievement.

You would think you could go to Skitter, directly to the oddity just on the left, but no, that will aggro the mob next to it. Ok, so go into Skitter, kill the mob, then wait for the oddity. But stay on the plates, because any closer to the mob spawn point and they will aggro. Still doesn't work because the next random who runs anywhere near the mob when it respawns puts us in combat, too.

Sometimes they run through the mob and directly to us, to ensure the mob aggroes on everyone doing the oddity. As if Festering Timelines needed an extra difficulty on top of the normal gameplay. (Also, why do I keep doing it with multiple groups after I already go the achievement?)