That was not a screwup. I'm not going to feel bad because someone made an unfortunate build choice here. I'll commiserate with them on the basis of a bad roll, and I'll be glad to applaud them on a clever or lucky moment, but an unfortunate choice of build? In a campaign, sure, but here?
Horse hockey. They totally shut down two types of somewhat common builds. Not just a little, but completely.
Maybe next time, they'll say "If you are using an Axe, then every time you hit with it, your PC and every PC within 3 squares takes 10 cold damage.". You got lucky and didn't take an axe, good for you.
Or maybe it'll be that every time the group healer heals, then every PC within 3 squares takes 10 acid damage.
Where does one draw the line between good encounter design and crappy encounter design? Personally, I wasn't impressed by virtually any of this design. I considered the entire encounter (from not being flexible for future encounters, to handing out a map, to telegraphing players to take fire resistance, to screwing over some classes) to be a pretty subpar design. C- at best.
Sometimes, life's just not fair. Thank goodness this is only a game, where you can go back and try the whole thing again with a character that doesn't have that limitation.
Not in my group. We only played it once. It was too boring with too few ways to modify it to play a second time, especially when a party wipes through it the first time.
Sometimes, life's not fair. But there is a difference between your PC heading into this direction and falling into a trap and the encounter designers saying "Bwa ha ha ha ha ha", those offensive Swordmages (as opposed to any other class) are going to be totally screwed here. The former trap catches any player, the latter trap is designed to screw over one type of player.
One is a matter of bad luck during the encounter, the other is a matter of bad luck picking a class that the designers totally screwed over for this encounter. That poster is totally within his rights to be hacked off at WotC because that part of the design is just plain terrible.
Seriously, KD, first you complained that modestly observant players could clue into the fact that fire protection was not a bad idea for this challenge, then you complain because there's a feature that can catch them completely offguard, maybe even kill them outright? Meanwhile, I thought the former was a nice treat for the forward thinking player, and the latter the sort of potential rude shock that made the original Tomb of Horrors a classic.
A treat for a forward looking player? You mean like those reading up on it on the Internet? Snort.
PS. I doubt you'll find a lot of people who agree with your POV here. Screwing a specific class over is just wrong. I assume the designers just thought they were going to throw in a feature to catch Eladrin off guard and just plain forgot about offensive Swordmages. Either that, or they're pretty darn poor designers.