First, a recap of Suggestion after the target has failed the saving throw:
On a failed save, it pursues the course of action you described to the best of its ability. The suggested course of action can continue for the entire duration. Ir the suggested activity can be completed in a shorter time, the spell ends when the subject tinishes what it was asked to do. Vou can also specify conditions lhat will trigger a special activity during the duration. For example, you might suggest that a knight give her warhorse to the tirst beggar she meets. Ir the condition isn’t met before the spell expires, the activity isn’t performed. Ir you or any of your companions damage the target, the spell ends.
If the suggestion was something along these lines:
- I suggest you run away so you don’t get hurt!
- I suggest you stand over there to take a more defensible position!
Note that I’m not asking about reasonableness. I consider both of these to be almost universally reasonable barring specific circumstances. These are worded to evoke opportunity attacks on the target. The first question: Does the target move after failing the save (on the caster’s turn) or do they wait until their turn to move? Please consider the following issues in your answer:
- Do other characters know what spell was cast?
- Do other characters know if the target made their save?
- Meta gaming by others that know this potentially sub-optimal action is coming, unless your arguing that the movement comes during the caster’s turn
- What if the caster’s concentration is broken before the target’s turn arrives? Again, unless you are arguing the movement happens on the caster’s turn.
If the suggestion were along these lines:
- I suggest you let me hold that heavy shield after your long journey!
- I suggest you hand me your spell focus to inspect it for quality!
The second question: In these instances, is this an Use an Object action on the target’s part, or would this happen immediately during the caster’s turn?