True, there is just one large problem with this tactic. Well, not a problem really, just a weakness. If I am on sentry duty and I decide to take a 20 on a spot check, that means that I automatically fail to spot anything that doesn't call for a reactive roll for 10 rounds. Then at the end, I spot anything that there is to spot at that moment in time (well, anything that is less than my skill modifier + 20). Then i have to go back and start failing for another 10 rounds until I succeed again.irdeggman said:You can take 20 on a Spot check if you have the time.
This means that a rogue could sneak up to the camp, stay 3-4 rounds and then leave and unless he was still there at the END of my take 20 attempts, I would have to rely on my reactive spot checks to spot him. If he happens to still be there when I finish my take 20, then I have a very good chance of spotting the rogue.
Also, it wouldn't be too hard to interpret the rule of automatically failing until you succeed after 20 attempts to be applied to all checks made with that skill. That would mean you would automatically fail your reactive spot checks too.