[andrewas]

Soling all the way through w/o any NPC assitance is entirely possible. In certain situation soloers even gain an advantage since protections that would normaly leave 5 party members vulnerable can cover one person with ease. And when fighting you can concentrate control on one character, without worrying about whether or not that damned avariel has wondered into another ambush.

You do have to pick your fights to a certain extent though, just wadnering into the dragons lair unprepared is as suicidal for a soloer as for anyone.

for monks:

EASY : kobolds and the like, magic users of any description (including the big JI himself), standard human types, anything with a low save, beholders, Demi-Lichs, Vampires.

MEDIUM : Members of the armed forces - they tend to have the equipment and numbers to cause some pain if you arent careful - Illithids, they can INT drain you, Adamantite Golems and Fire Giants have the THACHO and HP to cause some pain in groups > 2.

HARD : Dragons with acceptable levels of AI scripting. Deities.

IMPOSSIBLE : Nothing, but nothing, as long as you carry the correct equipment, IE something to cause fire or poision damage for those damn trolls.