I love hard dungeons but sometimes certain fights are annoying once they get past the dangerous point.
For example in AC Explorer you get a fight with Gravelings. One of them is a howler Gold level mob. We ignore it until we kill the other mobs. The fight is difficult at times depending how experienced your group is. However once everything is dead except the howler… the fight ceases to be any challenge. However we still have to wail on the stupid thing for 2-3 minutes.
My solution? Make the howler do MORE damage – making the fight scarier in the beginning – but lower its HP making the boring “mop up” phase go by quicker.
This is just one example and I could go into a ton more but that’s really the only balance change I think is needed in dungeons right now.