Killer Rabbit Eidolon

[joeyfixit]

Here's what I'd like:

My gnome Summoner is sitting in a field, petting his rabbit (tiny). Bigger, possibly Bugbear-type thugs come to harass her.

Suddenly the rabbit leaps out of her lap and bites their heads off.

Afterwards the rabbit grows to Medium size, the gnome climbs on its back and the pair hop off into the sunset.

How close to that do you think I can get within the rules?

Is there a way for an Eidolon to have an adjustable size beyond simply casting Reduce Person before, Enlarge Person after? Like, can the Rabbit's normal size be Medium

Is there a way to grant an Eidolon's bite the Agile quality? Or to add Dex to Natural Attacks some other way?

Is there a way to make Natural Attacks Vorpal?

[David knott 242]

If you have the Evolutionist archetype and are at least 12th level , you can start out the day with a size Small eidolon with a lot of evolution points spent on boosting its bite attack. Then you can spend a minute to transmogrify your eidolon into a larger form with the Mount evolution, put a saddle on its back, and ride away.

As for the Agile property, you can get Weapon Finesse, but I don't know of a way to get dexterity to damage unless a magic item that boosts unarmed attacks can be enchanted with that property and worn by your eidolon.

[Flaming Duck]

Agile Amulet of Mighty Fists (4k)

Best you can get in terms of size is to have the Eidolon small, and use reduce and enlarge as you've described.

[BretI]

Reduce Person when the Gnome was petting it.

Quadraped with Bite, Improved Damage (Bite), Ability Increase (Str), Feat: Improved Natural Weapon. Requires a 2nd level Summoner to have enough Evolutions.

1d6+3 -> 1d8 +3 -> 2d6 +3.

After that you are looking at increasing the Strength bonus and buying Ability Increase (Str) multiple times.

I don't see any obvious ways to improve it after that.

You could take Weapon Finesse to use Dex instead of Strength for the bonus to hit, there is nothing I know that would allow you to add it to damage.

I know of no way to get Vorpal on a natural attack.

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That said, you could also be more sneaky.

Biped eidolon with a Hat of Disguise and a Vorpal weapon. You would need the Weapon Training evolution for that.

[Magda Luckbender]

I wholeheartedly approve of this thread. I don't normally allow Summoners in my home games, but I'll certainly make an exception if a Summoner shows up with a vorpal bunny eidolon.

[Hawktitan]

You can have a small eidolon. The spells Evolution Surge and Enlarge Person to make it medium then large. Reduce Person to make it tiny.