Drop rate statistics - the Sengoku'ing

EDIT: also do we have any sources that tell us what the drop rate boost for familiars is.
All I remember seeing is the list on basilmarket. is it in the extracts?

No, there's some convoluted linking between several files (familiar to something else to buff, but it could just be familiar to buff and I'm thinking of monster life that's really convoluted). Basically all you need to know is the following:

Just to clear this up, Wolf Underling is actually 2x drop, and Ergoth is not. Without getting into all the data stuff, you can pretty much tell the bonus by the description (the descriptions are linked to their effects, after all).

Items OR Mesos
"Increases the [item or meso] drop rate by a small amount while summoned." - +30% Drop Rate for Items OR Mesos
"Increases the [item or meso] drop rate while summoned." - +50% Drop Rate for Items OR Mesos
"Increases the [item or meso] drop rate while in [Certain Area]." - +50% Drop Rate for Items OR Mesos in [Certain Area].
"Increases the [item or meso] drop rate by a large amount while summoned." - +100% Drop Rate for Items OR Mesos (Wolf Underling Familiar is this, and it's the only one for item drop).

Items AND Mesos
"Increases the drop rate of mesos and items by a small amount while summoned." - +20% Drop Rate for Items AND Mesos
"Increases the drop rate of mesos and items while summoned." - +40% Drop Rate for Items AND Mesos (Ergoth Familiar is this)
"Increases the drop rate of mesos and items while in [Certain Area]." - +40% Drop Rate for Items AND Mesos in [Certain Area]
"Increases the drop rate of mesos and items by a large amount while summoned." - +60% Drop Rate for Items AND Mesos (Big Spider, Mutant Pig, Toad (Castellan) are this)

The descriptions are consistent with the effects up to 4 variables attached to the buff, namely, two booleans (something like, itemUpByItem and mesoUpByItem, something weird like that) which dictate whether it increases meso or item drop, a variable which dictates rate, and a variable that's a range of mapIDs.

If either boolean is enabled (either item or meso drop), the rate variable can take on the values 30%, 50%, or 100%, but if both booleans are enabled (item and meso drop), the rate variable takes on the values 20%, 40%, or 60%.

The mapID range variable restricts certain familiars' effects to certain areas, which are listed in the description.

Oddly enough, I thought the way familiar drop buffs were represented were outside the norm (boolean + rate variable), but it's actually incredibly common, while dropRate (alchemy pots), which I thought was the norm, is not; skills are tougher, they're usually just single character variables.

It's also not apparently a boolean. itemupbyitem 1 represents a general item drop boosts while there's also itemupbyitem 2 which allows them to boost a specific item (for example, in the old monster book/card system, the nependeath card gave a 10% boost to the drop rate for nependeath honey).

That's all I've got on the subject of drop rate buffs, I'm afraid.