The Drunken Lizard Pub

Tier 6 invisibility costs 49 mana and with high enough meditation and perception you'll get 90 mana in the 18 turns the invisibility lasts, so +41 mana per invisibility. This can be a tough nut to crack for fighters as they couldn't see a mage while (s)he regenerates (roughly 2.3 mana per turn ...

Didn't notice anyone reporting this:

If you throw away torches, your encumbrance does not get updated. It updates only after you pick up a new torch. /Edit: Or apparently do anything else that affects encumbrance.