DND_Reborn
The High Aldwin
You're not following then.Huh?
Attack roll (this abstracts many things, which obviously must include proficiency in this deployment of their weapon)?
Dex/Thievery (this abstracts many things, which obviously must include proficiency in this deployment of their thieves' tools) Check?
And no? Correct, there is no Arcana roll to determine how proficiently the Wizard performs this deployment of their spell.
I don't understand how one comes to an alternative conclusion.
The attack roll isn't to determine if the fighter knows how to wield his sword when he attacks, the attack roll is to determine if he attacks successfully. You don't make a fighter make a Dexterity (Weapon) check to hold his sword properly before he makes the attack roll.
The thieves' tools check isn't to know how to use the tools, it is their application to overcome the lock or trap, etc. You don't have Rogues make an Intelligence (Thieves' Tools) check to determine which tool to use when trying to pick a lock or whatever.
Likewise, no Dexterity (Arcana) check is required for the wizard to perform somatic components in order to cast a spell they are proficient in using. Like the weapon attack and thieves' tools check, spells only require an attack roll or resisted by a spell save DC.
I really don't see what the hang-up is about all this... so, whatever.
