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A PC is under the effect of a Suggest spell and told to follow someone who had darkvision. The PC, who is under the effect, doesn't have darkvision, and they are led into a tunnel system that is pitch black. How fast are they able to move?
I can't find anything RAW which states that trying to move in darkness has any detrimental effects, other than the obvious statement of not being able to actually see where they are going.
The rules provide no guidance, therefore it is your job as DM to make a ruling.
The obvious upper limit is that it has no effect and you can move at your full movement rate and the obvious lower limit is that it is totally debilitating and you can't move at all.
Did I say no guidance? Well, there is a little bit - crawling, swimming and climbing cost 2 for 1 as does difficult terrain and, of course, if these combine (e.g. crawling in difficult terrain) you are down to 4 for 1.
In making your ruling, ask yourself these questions:
In making your decision try to come to a consensus with your players about what seems reasonable but remember you make the final call. Whatever you decide, stick with it for consistency (unless it is obviously failing).
With respect to the suggestion spell itself:
The suggestion must be worded in such a manner as to make the course of action sound reasonable. Asking the creature to stab itself, throw itself onto a spear, immolate itself, or do some other obviously harmful act ends the spell.
Walking into the dark might be an "obviously harmful act".
You are right, RAW just says that he automatically fails any ability check that requires sight. I don't think difficult terrain would take effect, as that is more for terrain that difficults passage even if you can see it (snow % ice, rubble, vines, slippery substances).
But any shrub or rock trip-worthy will give him a direct face-to-face with the ground (failed a perception check).
Modeling all the possible minor trip hazards with dice rolls, and including the lack of sense of direction that not being able to see where you are going to can take a lot of time.
As others have suggested, there is no RAW for moving whilst completely blinded. Partly this is a game balance issue, it is possible to be made blind by game effects, and the impact of not being able to hit a target in combat and failing perception checks makes the condition already quite challenging. Adding in realistic difficulties for free movement would make it even harsher (aside: I personally would have the condition nastier and more realistic against navigating in unknown spaces, but harder to achieve - higher level spells required, darkvision not so effective in pitch darkness so most monsters need at least some light etc - but that involves changing RAW, not really worth it for the few times it turns up).
I suggest that you apply a moderate "common sense" restriction to movement whilst blinded outside of combat, depending on the terrain and types of challenges in it. Most often I would expect this to result in a reduction in movement speed, or the character could take a risk when moving faster - a skill roll to avoid falling prone or moving to incorrect location. Allow players a chance to counter these challenges with ideas that might help (e.g. following a wall or being guided by hand). Try to not let it interfere with movement in combat - but if that spoils your sense of realism, encourage the players to at least describe how they are helping their blinded colleague so that at the problem is not being conveniently ignored.
