Can I have a ritual Fireball?
I think rituals should be a tool for any spell that you want to last more than a few rounds. Spell slots would be for "immediate effects", while rituals would be best for duration.
Why not?
I totally understand that some spells don't make much sense as rituals. Anything meant to be used in combat clearly cannot require you to sit down and cast it in 10 minutes! Fireball would be therefore normally be prepared in a slot.
But if the designers have to think
for each and every spell whether it should be allowed as a ritual or not, this is going to take a lot of design time... and furthermore it is prone to errors, because I'm quite sure there will be spells without a "ritual" tag that some people would like to be ritualizeable or wonder "why the hell didn't they allow this as a ritual?".
I think it would be so much easier for both designers and gamers, if we had a
general rule that (provided your character has the ability to ritualize spells) allows
every spell to be cast as a ritual. No ad-hoc analysis needed by the designers, saved space in the books, and saved timed to the DM.
If the main downside of that is that some spells could but would never be ritualized because there's little reason to do so, this to me is a minimal downside if one at all.
-> let's keep in mind here that so far a "ritualized" spell works exactly the same as a prepared spell, except that you cast it without preparation and the cost for that is a casting time so long that it would be impossible "on the fly" i.e. in combat, on the run, or in another stressful and strict-timed situation THEREFORE it is quite hard for me to imaging how this can be gamebreaking for any spell
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Knock as a cantrip? Give the next person who tries to open a sealed object a bonus to their check.
Knock as a memorized spell? Opens one sealed object up to a fixed DC.
Knock as a ritual spell? Takes time, but you can open sealed objects of a higher DC.
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Shield as a cantrip? Gain cover bonus for a round.
Shield as a memorized spell? Gain cover bonus that lasts for a short time (about the length of a combat)
Shield as a ritual? Grant 3/4 cover and/or extended duration.
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Magic Missile as a cantrip? Ranged attack that deals 1d4+1 damage.
Magic Missile as a memorized spell? Create X numbers of magic bolts that unerringly strike their target.
Magic Missile as a ritual? Err...probably not.
Really lovely ideas, but IMHO these would
seriously complicate the game design and DMing... these means that each spell's description will at least double, so for me it shouldn't really be attempted by the core game.