For reference: There is a duell in the module where a shaman tries to secretly help one NPC by continously casting Cure Wounds on him while supposedly only helping him “stand up” after he intentionally let‘s himself fall prone. To spot this, a PC has to specifically declare checking for interventions a then suceed a DC 15 perception-check despite being within earshot…
I tend to rule that any components are “assumed to be in the materials pouch”, unless there is a significant (relative to party wealth) gold price attached, in which case they need to be bought. In practice I found that only really seems to apply to resurrection spells.
From there, the only thing that matters to me is can you reasonably perform or (roll to hide to perform) the semantic and vocal components, as well as get out the materials of your materials pouch in your current state.
In practice this means I can ignore components 85% of the time, but can still temporarily de-power my players if needed for some reason.
They’re talking about verbal and somatic components. That spell doesn’t have material components.
Glad someone else knows it. As a player who frequently had to transcribe spells into roll20, I always just assume other people know the components certain spells take to cast and then end up confused if they don’t.
RAW verbal and somatic components give you away similar to making an attack. That’s why Subtle Spell and similar exist. There’s no “roll to cast secretly” mechanic on purpose, the benefit of being hidden is that you get advantage on your first attack