Since people were asking, here's my map of Under Warrens.  It's almost certain that's there's a far better way to lay it out than I have but since nobody else is uploading their maps I thought I would go first.

{{:underwarrens.png|}}

If you kill enough mobs in the area around rearwall/hallwall then Squaretooth will pop.  Think of a mob similar to Muranog and you won't be far wrong. Squaretooth before he comes out lives behind a climb exit, requires insane climb to go there(?)

To go south of the area marked "rock boulder" you use the command "rock boulder" to open the area then only hobbits can enter. (Kaspar: I didn't have to use this command at all) //My memory is extremely hazy, but I think the "rock boulder" is a thing trolls can do to flush a Hobbit out of that area, since they cannot otherwise enter it. Deals damage or something to players inside. Might be wrong about this - it's been a while. -Belamir// I believe you need to kill a troll mob in there and the reward is a pair of lobstered steel gauntlets; described as, "like shining for your hands" and an archaic copper wristband; which seems to be +10 max mana. This troll is mob is very hard to stab, stabber said like Willow. Requires a cleric outside to resanc and heal the hobbit.

The area above rottenvegetation is sunlit so BEWARE!

You can also butcherthe giant moulds to get a chance of chitin which gives a huge str boost for 1 tick (enough for + 28ob on troll) then -4 str for around 3 ticks.  Needs testing.