Homebrewing a mouse familiar


Homebrew and House Rules

Grand Lodge

I'm starting a new campaign and I have a player who wants a mouse familiar. Since I haven't found rules for such, I was thinking of using the squirrel as a starting point. My main concern is that it will be too powerful for scouting, for two reasons:

1. It seems like a mouse should be Fine size rather than the squirrel's Diminutive.
2. As another thread pointed out, even if a mouse is spotted sneaking around, the enemy isn't likely to think much of it, whereas many other familiars would draw more attention.

Any thoughts?

Also, are there any methods available that would let an observer distinguish a familiar from just another animal?


Use rat.


Familiar Folio has a whole section on approximating Familiars.

"The easiest way to formulate a familiar when there aren’t already stats for the creature you’re looking for is to examine the list on the inside front cover and find the animal closest to the one you have in mind. You can then simply use the statistics of the existing animal as those for your desired familiar. This ensures that the familiar is balanced, and it doesn’t require you or the GM to tinker with the animal’s statistics.
When approximating familiars, the most important thing to realize is that a given familiar’s statistics can be used to represent a wide variety of other creatures of the same creature type, not just that species. For example, the rat is a small, agile mammal, so it’s a reasonable leap to use its statistics to represent a mouse, shrew, or other similar small mammal."


The mouse cannot sneak very far from it's master. Also, it cannot go into an area where it smells any sort of feline. The smell of peppermint partially blinds them. It adds +4 to the masters stealth. Note that it is not a natural, mundane, mouse, so it can be larger than normal.

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