The Manna Mosquitos exist in only a few, highly magical locations like the Sorcery Springs Geyser Basin. Slightly larger then normal mosquitos, they have a ravenous appetite for blood. Instead of spreading disease however they spread magic. A non-magical person bitten by one of these can often gain a limited ability to cast magic, but at a price few are willing to pay.True mages and witches avoid these pests as much as possible.
There are two big problems with allowing these to bite you and thus gain magical power from them. First, if too many bite and too much blood is taken, it can lead to severe weakness or even death.
The second thing is, the bites itch like crazy for days afterwards, and giving into the urge to scratch them can set off random magic as shown in the table below.
2-No effect except that the bites bleed.
3-the area bitten turns green but without other ill effects.
4-Random lightning spell goes off from bite site, burning the caster and whoever it hits
5-Short term change of gender (for an hour)
6-Bites explode, causing severe harm
7-Bites start singing random song when scratched
8-Small dead things (rats, frogs, toads, snakes) re-animate as Undead if within three foot of the person scratching.
9-Rotting spell cast on bite area, effects can range from mildly annoying to deadly depending on how bad it gets.
10-Random love spell cast straight ahead of scratching person with maximum range of twelve feet.
11-Person gains the powers of a priest of Mathom, the God of Delays for a whole hour, much to the immense annoyence of those around him.
12-Random flying spell cast on bite site, causing victim to hover a foot off the ground and find moving very difficult. Effects last for fifteen minites before it wears off.