A pet peeve of mine is people who think it's Ok to target party members in area effect attacks. IMO, unless the characters have full immunity from the effects of the attack, then it is never a good idea.
Well, first of all, requiring total immunity is way excessive. A decent level of resistance is plenty. If the party wizard deals 3d6+7 damage with fireball, and the tiefling swordmage on the front line has fire resist 8, you're looking at average 9.5 damage to the tiefling in exchange for 17.5 to a whole bunch of enemies*. That's almost always a net win.
Even if the party member lacks resistance, though, it can be a good move. From a tactical perspective, it mostly comes down to numbers; as a rule, if you take X% of your party's total hit points but X+1% of the enemy's, it's a good trade. If you take X-1% of the enemy's, it's a bad trade. (Obviously, there are a lot of nuances that I'm glossing over here; you might accept X-1% if it will take a monster to zero and thus reduce the enemy's damage output.)
From a gameplay/social perspective, it's fine as long as you get permission from the guy you're about to blast. Front-line fighter types tend to be pretty gung-ho, so they're usually quite open to the idea of taking a hit in exchange for hitting four or five enemies. But you never blast a party member without asking first.
They should treat the other characters as the living beings that they are supposed to represent, and the Area Effects as the potentially-lethal attacks that those are supposed to represent, rather than treating the whole thing as just a set of playing pieces moving around a board.
That's a legitimate argument, but I think it's missing the intentionally larger-than-life, heroic aspect of D&D. The PCs are heroes; they're better, stronger, faster than ordinary people, and they know it. And they're also a little bit nuts. You have to be pretty crazy to take on a bunch of seven-foot hyena-men with axes who have you outnumbered two to one.
So is it really that unreasonable for the party fighter to yell, "Blast us all!" and the wizard to oblige? Keep in mind that the fighter has seen the wizard's blasting spells before, knows he can tough them out, and is prepared to duck and roll.
[SIZE=-2]*Actually, it's even better than I implied. A swordmage's primary stat is Int, which means a high Reflex defense, so there's good odds the wizard will miss the tiefling and deal only half damage. At that point you're looking at maybe a couple points of damage to the tiefling, versus 8.75 (miss) or 17.5 (hit) to the enemy.[/SIZE]
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