Nemesis Destiny
Adventurer
I loved using 'swallows whole' mosnters in 3.x, but have not had the chance yet in 4th. So far, the only really surprising moment we've had was when I used some Dark Sun monsters reflluffed for my viking campaign.
The characters were 1st level, we were using themes, as well as some bonus stuff I added, so it was not a matter of character power. In one fight, the monsters got surprise and managed to take the Paladin from full to below negative bloodied before she could act, thanks to a critical hit with a recharge power, and brought another character down to 1 hit point. From there, the characters pulled out a win, but it made me sweat, because it wasn't supposed to be all that hard of an encounter.
It was later on that I found out that those particular Dark Sun monsters were horribly under-leveled, so it was more like a level 5 fight.
The characters were 1st level, we were using themes, as well as some bonus stuff I added, so it was not a matter of character power. In one fight, the monsters got surprise and managed to take the Paladin from full to below negative bloodied before she could act, thanks to a critical hit with a recharge power, and brought another character down to 1 hit point. From there, the characters pulled out a win, but it made me sweat, because it wasn't supposed to be all that hard of an encounter.
It was later on that I found out that those particular Dark Sun monsters were horribly under-leveled, so it was more like a level 5 fight.