My question: is there any official statement that says that a spell has the same words/gestures independent of who's casting it?
So, for example, if a halfling wizard casts fireball: would the words he has to say as verbal components and the gestures he does as somatic components be the same as an elf sorcerer casting the same spell?
Would a ranger know that another ranger that he can see cast Hunter's Mark on him just by seeing the somatic components and/or hearing the verbal components?
The rules do not provide specific words for a spell, as they do with material components. Nor do they usually list specific hand gestures (Burning Hands is an example of an exception). The rules do say:
Most spells require the chanting of mystic words. The words themselves aren’t the source of the spell’s power; rather, the particular combination of sounds, with specific pitch and resonance, sets the threads of magic in motion.
In the description of the Weave (which is not binding on non-Forgotten Realms campaigns), it goes on to say:
but casters have varied ways of naming and visualizing this interface
It is unclear from the text if this means "individual casters", or "types of casters", which could be grouped into arcane and divine, or even broken out by class or school.
Note that some casters can use Counterspell against another's spell, indicating that they know a spell is about to be cast, but there is nothing that says the caster of Counterspell knows in advance which spell is being cast, nor at what level. This would seem to imply that each caster's style is unique, but this is by no means a strong conclusion.
In the absence of specific wording to the contrary, the final interpretation must lie within the province of the campaign and the DM.
First, look at verbal components.
Most spells require the chanting of mystic words. The words themselves aren't the source of the spell's power; rather, the particular combination of sounds, with specific pitch and resonance[...]
Now, ask yourself if any two spellcasters can create exactly the same pitch as each other during spellcasting. Would a male and female spellcaster cast fireball with the exact same pitch, or is it more likely that the male caster will use a lower pitch, while the female caster will use a higher pitch?
If a specific resonance is required that is the same across all casters, does that mean nobody can cast inside an echo chamber? Being inside such a chamber will definitely create a difference in resonance, as the mystic words will start to overlap with each other, resonating with itself, totally unlike the caster's normal voice.
The answer to both questions is no. Spellcasters have different voices, between males and female, and between members of the same sex. They also change resonance from place to place. However, in any situation, regardless of gender, they should be able to cast the same spells (provided they know them, and the spells are in their class list). A male caster inside an echo chamber will be able to cast fireball just as well as a female caster outdoors.
Yes.
Most spells require the chanting of mystic words. The words themselves aren’t the source of the spell’s power; rather, the particular combination of sounds, with specific pitch and resonance[...]
What we see here is that there is a specific set of sounds that a caster can make to create the a spell. This shows that the incantations are specific to the spell and not the caster.
If you need further proof, consider the scroll. A caster can only read a scroll if it is on her spell list. Imagine a Scroll of Light which casts the cantrip Light. The Light spell can be cast by the Wizard, Sorcerer, Cleric and Bard. If this Scroll of Light had a specific incantation written on it, specific to the Wizard (for example), then the other classes wouldn't be able to activate the scroll. Since this is not the case and any caster who has the spell from the scroll in their class list can use the scroll, we can see that the incantations for each class are the same.
As for recognising spells, if the second ranger is in range and able to see and hear the casting ranger AND knows the Hunter's Mark spell, I usually say that the second ranger would know that the Hunter's Mark spell is being cast, although he might not be able to guess who the target is. I would suggest an arcana check to determine the target as a reaction, and also to use the arcana check to know which spell is being cast if the second ranger does not know the spell. I would suggest a very high DC to determine the spell during a reaction, and if the spell is not on the class list of the ranger, I would suggest that it would be much higher.
A spell’s verbal component, like any chant or song, is a “particular combination of sounds, with specific pitch and resonance” (PH p. 204).
Just as you can recognize a song even when it’s sung by a different singer, a creature might recognize the particular chant of a spell.
Burning Hands mentions specific somatic gestures in the spell description — casters must touch their thumbs together. There is no allowance for a caster deciding they would rather make another gesture.
I would posit the somatic component of Burning Hands are not unusual, even if it’s unusual that the gesture is defined in the rules. It’s just the example that is called out. Other spells would have their own, particular “forceful gesticulation or…intricate set of gestures.”
The material components of given spells are quite particular. A caster cannot just substitute sapphires and a few garnets, instead of rubies. There’s no basis in the rules for assuming the verbal and somatic components are any more free-form. “Particular" (PH, p 2014) is the word.
Although the components of a spell are particular that does not make them obvious. Often, it is the effect of a spell that is obvious:
“Unless a spell has a perceptible effect, a creature might not know it was targeted by a spell at all. An effect like crackling lightning is obvious...” (PH 204)
Sage Advice backs up the notion that casting a spell is subtle: “Some spells are so subtle that you might not know you were ever under their effects.”
Unfortunately, we don’t really get any guidance on how to determine the how likely it is that the character “might not know” about the casting of a spell — that will be a matter of DM ruling.
