Traps.

Thieves
Assassins
Rogues
Rangers

Would all have the trap skill to varying degrees. It would be dex based and require components.

A trap can be set once every minute for a thief, two minutes for an assassin, and three minutes for ranger and rogues. If you fail you take damage and are stunned, so doing them in dangerous places can be a bad idea. If you succeed the next perm, mob, player that enters or spawns in the room will have to make a save based on how well you set your trap or be effected by it. It will not make the target aware of your presence if you are hidden, but will attack you if they can see you.

There would be three traps.

Snare trap - the victim cannot move from the room or flee based on how well you set the trap.
Spike trap - the victim takes damage based on how well you set the trap.
Jaw trap - the victim is stunned based on how well you set the trap.

Possible kits for some classes.

So, when a player chooses a class he as the option to play a 'kit' of that class. The class will progress as normal, but there will small modifiers to make the class play a bit differently.

Paladins:

Inquisitors: Inquisitors are detectors of unholy deception. They banish the witch and the heretic, and carry tools for their cause.
Benefits:
When prayed they Detect-Invis
Recieve a small bonus to magic resistance at lvl 1
Penalties:
May not turn

Demon Hunters: Choosing to hone their skills to purge Derlith of demons and their unholy kin, the cambions.
Benefits:
Recieve a small bonus to mental attacks resistance at lvl 1
Recieve a bonus to hit demons
When payed resist-heat
Penalties:
May not turn

Ranger:

Beast Master: Friends of the animals they may call once a day to summon an animal companion.
Benefits:
Can 'call' to summon an animal that acts at half the level of a druid's summon.
Penalties:
May only train in blunt weapons.

Deathknight:

Night Stalker: These unholy warriors stalk the streets smiting those they feel wish to undermine their god's will.
Benefit:
May envenom as an assassin.
May backstab as a thief.
Penalty:
May not wear armor above leather.

Druid:

Shapeshifter: May summon the strength and speed of a wolf at lvl 1, then in later levels other animal forms.
Wolfform: Bonus dex and strength.
Bearform: Bonus con and strength.
Lionform: Bonus dex, con, and strength.
Penalty:
No barkskin, no conjure.

Bard:

Skald: Leaders of barbarian hyms these musician warriors are seldom left out of a fight.
Benefit: Bonus to attack power. *6 instead of *4.
Penalty: No charm, barbarian, dwarf, h-giant, h-orc, human, minotaur, ogre, and troll only.

Virtuoso: A mixture of acrobat and warrior, wizard and performer, these jacks of all trades are often famous around Derlith.
Benefit: May wield two weapons. Parry.
Penalty: No charm, no identify.

Assassin:

Bounty Hunter: These stalkers of men are more about capturing their prey than killing it, setting subtle traps to subdue them and lying in wait.
Benefit: May set traps
Penalty: No envenom, no peek, no scout.


These are all just examples.