The Crimson Binome
Hero
I think that any spell cast from a level 9 spell slot should be as powerful as a level 9 spell. Burning Hands should hit as hard as Meteor Swarm, as long as you're putting the same amount of energy into it. The thing is, it's hard to interpret what that means, for something like Grease or Shield.Part of my point, however, is that spells like Grease and Shield gain no benefit from using a higher level slot, as where many spells do. If spells are more powerful using higher level slots, all spells should be written as such IMO.
Making the entire world into difficult terrain, and knocking everyone in the world prone, is not on par with Prismatic Wall or Shapechange. There's no way to make Grease worth a high-level spell slot. I've seen games that try to make that sort of thing work, and if you try to fit every effect into nine degrees of power, it inevitably ends with multiple spell levels where a spell is not worth casting.
If damage-dealing spells scaled automatically with level, then one major benefit would be removing the language of up-casting from the game, so we wouldn't even worry about the disparity.
That's a good point, really. As high-level casters gain more and more spell slots, they should be able to afford spending a lower-level slot when they need to attack. But they don't want to spend a level 1 spell slot on Magic Missile, because they know the spell slot is much more valuable for Shield, so they would end up firing their crossbow and complaining about it.I guess in that since, it makes me wonder more about the cantrips. Having cantrips scale up with level keeps them relevant, which was the intent, while lower spells (potentially) decrease in effectiveness at higher levels unless you use a more powerful resources (higher level slot) to keep them relevant. Given the number of spell slots available at higher levels, spells used in an encounter, number of encounters between rests, and the increased value/power of higher level spells and possessing wands, staves, etc., it seems casters should not have to use cantrips often. If that is the cast, why scale them with level?
Given that a level 1 spell slot is still useful at high levels, I don't know how many spell slots a wizard would need, before they felt comfortable using one for Magic Missile. It would have to be enough that they would never worry about running out, but at that point, they're nigh-invincible from casting Shield every round. Cantrips thus serve the purpose of giving wizards a spell that they aren't afraid of using, while maintaining the spell slot economy as regards to Shield. By auto-scaling cantrip damage, it makes wizards feel like they're still contributing (in a way that wasn't true with Pathfinder cantrips), so they feel less inclined to go all-out with their spell slots and force a five-minute workday.