Ok, I can see now that you are new to designing encounters for d20.
thankfully conan doesn't use CR. i'm quite familiar with designing encounters for conan and capable of running a balanced game despite the questionable ruleset.
A fourth level thief should be CR4. Meaning that he is (as a general rule) an appropriate chalenge for a party of four fourth level PC's. Sending a group up against a challenge 2 levels higher than them is, by definition, a "tough fight".
i'm sorry, but, that system is no good.
you're telling me that a guy fighting 4 of his equals teaming up on him is an appropriate 'challenge'. sounds like an automatic victory with a chance of wounds!
assuming a 4th level soldier a CR4 as well... these guys could take down a 4th level soldier pretty easily at their current level.
Think about it this way. It takes 1000 XP to make it to second level. It requires 6000 XP to make it to fourth level. So your level-4 Assassin quite literally has more experience than the entire party put together Shocked . When I put it in those terms does it seem so unreasonable that he can screw them over so badly? Twisted Evil
it seems unreasonable that 4 levels in any other class would make him a much easier encounter.
as far as XP goes, i get your point, but XP don't equate to anything other than levels. a character with 3,001 xp is no better than a character with 5,999 xp. so the fact that he has more xp then all of them put together doesn't mean a whole lot.
That is not a balanced encounter even though both sides have 8 character levels (4x2nd level PC vs 1x4th level assassin +4x1st level mook). At a rough guess that encounter is approximately EL 6 which is triple the average party level. So yes, that is a possible TPK. And no I'm not surprised by that.
4 guys against 4 guys of equal level is an exactly fair fight. this means a very dangerous encounter for each side, sure, but you can't tell me it's not a balanced encounter. it couldn't be any more balanced. it's the definition of balanced. an advantage arises from the one side being more skilled at ambush.
i understand that you don't want to give the players a totally even fight, otherwise they'll die half the time, but my PC's regularly take on large groups of enemies with equivalent skills to their own. but none of them have the ability to do 20 damage on an average hit.
i also understand that the one guy is more effective than 4 weaker guys out together, and thus is a tougher encounter than 4 weaker guys, BUT the fact is, this guy would have a harder time up against 8x1st level guys than up against 4x2nd level guys, just because he can only kill so many per turn.
So what you really have with Mr Assassin here is an encounter that flip-flops between CR 3 (reasonable) and CR 5 (deadly) depending on the luck of the PC's in that critical surprise round.
And I'm ok with that. I can think of countless examples both from real-life military history and from popular fiction where ambushes are either super-deadly for the poor sucker caught in the trap or else backfire horribly. The scenario described seems to fit quite well with the "grim n gritty" Conan meliu IMHO.
i'm okay with it too... he's a 'boss', so he's supposed to be difficult. again, the issue is with thieves in general getting attacks which are way more damaging than others.
Well.... you are the GM, you are designing the encounter. If you have him siting in a hunting blind waiting where he knows the PC's are going to walk under him then you have just given him an advantage. You have made the encounter harder the same as if you had equiped him with a master work Stygian bow instead of a crapy hunting bow. Thus the encounter is more dangerous than his pure levels indicate. That is not a flaw in the system nor is it a feature. It is your judgement call as the GM.
Don't just pass it off as "well, he is a thief with ranks in hide so of course he ambushes them!". If you want the encounter to be more reasonable for the PC's then do something about it. How about if you have a dying npc stumble up to the group and deliver a warning that their enemies have hired this deadly proffesional assassin to go after them. Now the PC's are on the lookout maybe they will not walk blindly into an area that looks like a set-up, maybe they will suprise you and come up with a clever way to lure this guy out into the open. You're the GM, design the encounter you want.
and i will, but i think you're misunderstanding... i haven't designed any encounter. this is a recurring character, and i'm not sure yet exactly where or how he will show up next. i've got his stats, and i know that what he does is lie in wait for people and then shoot them from hiding when they're not looking, that's a no-brainer for any shemite thief character, that's his job. the fact that he has a nice bow isn't me giving him some extra advantage, its a cultural weapon: what else would he have? the party's nomad has one, and the barbarian has a 2H battle-axe. that's the way the world is.. i don't think it's unfair of me to not strip him down to just a dagger.
i haven't decided that the pc's are automatically ambushed. the guy has a hide+11 skill (+13 in desert), you can be damn sure he's going to use it! sure, that doesn't mean he's not going to be spotted, but his hide is def. better than anyone's spot.
Those are my thoughts on encounter balance. I also have some thoughts on the rules for running an ambush (I've seen you make a few errors in the last couple of posts) but I will post more on that when I get home this evening.
do tell... (i know that you have to re-hide if you're shooting from hiding, with a -20. but i would ignore that rule at long range, and of course at long range he wouldn't get sneak attack, so unless he was totally drunk, he would probably wait til he could see the whites of their eyes, if possible. so he only gets one shot off before they see him, probably).
again, i'm not really worried about balancing the encounter, i'm mainly talking about the mechanics of sneak attack and how it makes a character buffer than his level suggests. sure, a sniper should be deadly, if the PC's go in the wrong place, they will be sniped.
my main point here; sniping like this shouldn't be the sole domain of thieves and pirates, but perhaps a feat that they have easy access to. i would of course give them something (more appropriate) to compensate for the loss.[/i]