beaver1024 said:
For a start, by casting fly, the mage is saving the party from consuming precious resources to raise him when he dies.
Otherwise known as "contributing nothing to the combat".
Secondly, the mage wouldn't be frying party members with the difficult to aim fireball, which even if it hits won't do anything significant in any event.
15-40 points of damage to multiple creatures isn't significant? Hmm. I wonder why we bother with swords at all... they do even less.
If your adventures
only take place in 10'x10' rooms, then fireball won't be that useful. I've never seen it be unusable, however. Even in a 20'x20' room, the party can stand in the doorway and lob the fireball into the far corner and have it not affect the fighters.
Do you use miniatures or tokens to represent the battle? Having an accurate representation of the battlefield greatly improves the use of Fireball.
Thirdly but most importantly, the mage can cast fly on the fighter and allow the fighter mobility to deliver their killing blows.
Trying to work this one out. Why, exactly, does the fighter need mobility?
Fighters need to stand still and hit the opponent a lot (Full Attack), either with bow or with sword. If they're moving around the battlefield, that negates their usefulness. (Theoretically you can have the fighter hovering in mid-air shooting arrows down, but then the monsters are engaging the other members of the party - who are less equipped to deal with it than the fighter).
Fly is a great spell, but - in general - it isn't a combat spell, but a overcoming other obstacles spell.
Cheers!