Monsters have roles too. Skirmishers are hit and run, and can inflict decent melee. They often have sneak attack like damage. Lurkers need to hang back more, and are more effective with melee support. I suspect if you had run something like 2 Lurkers and 3 Skirmishers, you would have had a fight a great deal more difficult than you did from just using 5 Skirmishers.
Likewise, a brute is basically a hard hitting low endurance opponent. Making it elite will give make up for the relative endurance trade off that Brutes have relative to Soldiers. But a controller, elite or otherwise, works best with backup. If you want a level 5 type battle, I suggest using a 4th level elite controller with minion support.
END COMMUNICATION
The fights all came out of Thunderspire
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1. 5 Wights (5 skirmishers, and the room didn't really give them much room to manouver. They were not such a big threat in themselves, but they reduced the endurance of the party for later encounters because they sap healing surges)
2. 1 Elite Theurge, 2 Spined devils, 2 Duergar Shock Troopers (1 elite controller and I can't look up the other two - I imagine probably 2 skirmishers and 2 brutes? )
3. 1 Gelatinous Cube, 2 wraiths (if I'd used 3 wraiths as per the encounter, and played them even slightly aggressively it would have been a TPK. Even as it was I was slightly generous).
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Because wraiths are insubstantial and take half damage, it is almost as if they have regeneration 10 rather than regeneration 5. Their phasing ability also makes it much easier for them to avoid being ganged up upon. As Lurkers they like attacking the strikers and controllers and certainly managed that rather too well in the encounter I ran. The fact that they can spawn additional wraiths too would have made them even more dangerous if I'd had them concentrate their attacks.
The gelatinous cubes ability to 'hoover up' people and do automatic 10 acid damage to anyone in them made it an incredible "controller" in that it dominated and shaped the battlefield as well as handing out huge amounts of damage - during the combat it must have inflicted well over 100 damage aggregated across the PCs.
However, I'm interested that apparently nobody else has found creatures which turned out to be unexpectedly difficult for their XP (which is, after all, one of the essential balancing factors for putting creatures together in an encounter).
Has nobody else found the equivalent of the Remorhaz?
Cheers