What drop rate does Castellan familiar give?

This familiar

+60%

+60%

K thx, do you know the order of all the drop rate familiar and their %
spider, mutant pig, wolfing (2x) and some others that I don't know.

"meso + items by a large amount" = 60%
"items by a large amount" / "meso by a large amount" = 100%

Other stuff is lower.

o wow didnt know that, thx Stereo

If you want exact rates:

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)