[Jack Simth]

If they are individually "tough", lots of them at once are fatal. It's part of the reason I haven't been sending more than one difficult demon at a time in (the other being that it's difficult to track lots of critters at once).

But if you want, I suppose one CR 12, 2 CR 8's, 4 CR 6's, 8 CR 4's, and 16 CR 2's make for an encounter level of 15... when we have a party level of 14.9; which could make for a nominally resonably difficult encounter ... for rediculously low amounts of xp (630 each for Derrel, Jason, Kaylin, and Elorin, 450 for Kibin). Of course, CR 2 Orcs have three levels of warrior, and probably hit an AC 17 wizard on about a roll of 10 or so, with Greatswords dealing 2d6+4 damage (with appropriet Composite Longbows, they only deal 1d8+3, on a roll of 13 or so, but all can fire at once... potentially at the same robed target... have to clear out the spellcasters first... Orcs are intelligent, after all). Be ready with battlefield control spells and escape battle spells.

A duel situation, on the other hand.... of course, that would be pretty much one on one.... or are you thinking something along the lines of covert ops/assasination of an opposing commander?

Edit: Let's see.... 100 CR 1/2 Orcish Warrior 1's + 1 Orcish Cleric 15 Warlord would officially be a CR 16 encounter. Of course, 100 longbow equipped Orcish Warrior 1's, shots divided evenly amongst 5 targets, would get roughly 1 hit per round per target... assuming that the targets all have AC 21 or better, and assuming totally mundane arrows. A cleric 15, on the other hand, could cast Greater Magic Weapon four times to give each two +3 arrows; burning 5th level spell slots as well, each could get four. 20 arrows per character the first round, at +4 to hit, means: AC 24 or higher (roll of 20 only): 1 hit; below that, +1 hit per -1 AC; so AC 17 could expect.... 8 hits the first round, for 1d8+3 damage (1d8+6, for Composite Str + 3 Longbows at 400 gp each... but that'd be overkill....); 1d8+3 averages... 7.5, eight of them would make for an expected (roughly 50% chance of that amount or more) 60 points of damage... and Kaylin only has 54 hp... assuming they don't give any preference to the spellcaster in the Robe of the Archmagi. Everyone else in the party would have sufficient AC that they would only take one or two arrows....

But do I really want to track 101 Orcs? Decisions, decisions.....