Well, hoping I'm posting this in the right section.
Important part in Bold~
Since my last topic is about 6 pages back in the forum pages and since this topic is a little different, I thought I should make a new thread.
For those who did not read my previous topic, here's my situation: I DM a game with Gestalt rules and pathfinder classes accepted in the 3.5 rules. I have four players(A Dread Necro/Artificer(Now necropolitan), a Monk/Alchemist, a Warblade/Bard and another player whose classes I do not remember(We play once per two week and he was absent from last game, so I haven't seen his character in a long time and he was new to the game).)
Right now, the players are not all of the same level, because the artificer took an item familiar and spent a lot of xp on crafting. The monk took vow of poverty, the new character is still a bit behind the others and the warblade is... well... It doesn't look like he can do much. I guess I should help him optimize a bit.
Still, before optimizing anymore than that, they need to level up and the characters gave a reason for their characters to do so. The thing is, I don't really know what it is I should put in front of them.
Last game, I sent them a Quanlos(CR6)(with no thrall though) that was defeated in one round. I sent them two corrupture(CR9 each)(One in a tree and the other laying in wait in the swamp at the bottom of said tree.) The players killed the first ooze with one spell and the other took a bit longer. Next I opened Monster Manual II, not realizing it was 3.0 and picked up a CR11 creature. I thought it would be an easy fight, but they needed an NPC's help to escape the Juggernaut's arms.(I believe the artificer will soon be crafting rings of freedom of movement...)
They ended up on that particular Island because they were sent there by Fiend Folio's Kaortis who wanted to get rid of something. What I'm wondering is... What kind of monsters would cause problem to the Kaortis that I could put against my players for a few encounters. They are on an island covered with forest and swamps, though there is an underground area(which entry is now protected by a Juggernaut :S) The players want to gain XP quickly so it has to be kind of high CR but not something that they cannot win against.
Important points to note:
The Dread Necro is undead, can fly at will(effect from its cloak) and is pretty good at hiding.
The Monk/Alchemist is able to enlarge himself, is pretty good at grappling, and has more attacks than the usual monk
The Warblade/Bard barely uses his bardic music because he'd rather fight with his trident.
The other character is a quite low-level character(5~7) in comparison to the 8~10 of the other players so he's still kind of squishy.