howandwhy99
Adventurer
I do something similar, but still account for the wandering monster checks. I roll these checks prior to play.I don't much care for random encounters because they do require a bit of prep, and they might not happen, which would have wasted my time. What I do do however, is plan some non-random encounters and pass them off as random. Basically, whenever there is some travelling happening, I work out how many days it will take, and tell them as much, then roll a die for each day, paying no attention to the result. Either something happens, or nothing happens, and that's all been decided before hand. Player's get the risk factor, because they don't know that it's not random, and I get some actual mileage out of prep work.
Say a Forest terrain is 1 check every 6 hours. This has to do with the wildlife density. This can change as some creatures are diurnal others nocturnal. I roll out a number of checks accordingly for days and nights and determine encounters.
If the players then enter into this forest terrain, then I know when they have wandering encounters and these are tailored to the wilderness level they are within. Terrain area matters here for difficulty. A large forest may take days to cross following a river, weeks or more by dead reckoning. A road should take less because road terrain enables faster movement, but it may meander depending upon its construction method. Its length is a difficulty rating too.
So let's say 6 hrs in the forest is 1 check worth of prep, 1 day is 4, 2 days 8, etc. I make the rolls beforehand and prep the creatures, etc., which stay prepped until something either changes the pop. density of the forest or are met by the PCs. If any monsters survive the encounter, they become "named NPCs" and are tracked separately.
NPC wandering encounters are even easier because they happen "off screen" and can be resolved with a few aggregated rolls.
EDIT: monster encounter prepping in earlier editions really is quite easy and I think it can be very easy in 4E too. The Monster Manuals already have most of the statistics generated. It's simple generation rolls that need to be made and recorded. Things like HPs per creature and treasure.
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