I hope you enjoy the bitter root frog, and I'll be back tomorrow with another froggy monstrosity.
I'd also like to point you to an archetype by Landon Bellavia, inspired by the arcanaruna: https://questwriter.tumblr.com/post/178875933973/arcanarunologist. The archetype does a fantastic job of showing an arcanaruna's growth from juvenile to adult. I hope you like it as much as I do!
This slime mold is shaped like a frog and has nodules of fungal material protruding from its body like warts. When it moves along a surface, its front half shifts and the back half flows quickly toward the front half.
Bitter Medicine Frog CR 8
CN Tiny plant
Init +9; Senses low-light vision, tremorsense 30 ft.; Perception +14
AC 22, touch 18, flat-footed 16 (+5 Dex, +1 dodge, +4 natural, +2 size)
hp 102 (12d8+48); regeneration 5 (cold)
Fort +12, Ref +11, Will +7
Defensive Abilities amorphous; DR 10/slashing; Immune acid, plant traits; Resist fire 10
Speed 20 ft., climb 20 ft.
Melee slam +16 (1d2–4 plus attach)
Space 2–1/2 ft.; Reach 0 ft.
Special Attacks attach, forced ingestion
Str 2, Dex 21, Con 18, Int 5, Wis 17, Cha 8
Base Atk +9; CMB +12; CMD 19 (can't be tripped)
Feats Dodge, Go Unnoticed[APG], Improved Initiative, Lightning Reflexes, Mobility, Weapon Finesse
Skills Climb +13, Perception +14, Stealth +20
Environment temperate and warm forests
Organization solitary or apothecary (2–12)
Forced Ingestion (Ex) If a bitter medicine frog succeeds on a grapple check to maintain a grapple, it forces itself down its target's throat. It removes any sickened or nauseated conditions currently suffered by its target, and its target is immune to spells or effects that cause these conditions. While within the target, the bitter medicine frog deals 8d6 points of acid damage to the target each round (DC 20 Fortitude save halves) and it releases paralyzing spores every 1d3 rounds. When it releases spores, the target must succeed on a DC 20 Fortitude save or become paralyzed for 1 minute. The save DCs are Constitution-based.
The bitter medicine frog takes half damage from attacks targeting the host or including it in an area effect. Removing a bitter medicine frog requires cutting into the victim, which deals 2d6 points of damage, and a successful DC 20 Heal check.
Bitter medicine frogs get their name from their uniformly frog-like shape and their dangerous use to combat nausea. The cure often proves overwhelmingly more lethal than the symptoms it’s meant to alleviate. While they look like strange frogs, they are actually colonies of slime molds with a hive mind. Bitter medicine frogs reproduce by implanting themselves into living hosts and consuming their hosts from the inside. The originating colonies die along with their hosts, but the spores they use to paralyze their hosts form new colonies which burst from the corpses one month later.
Bitter medicine frogs roost in trees and are difficult to spot among the greenery. They use height to their advantage, so they can drop onto the heads of their victims. However, they are fast climbers, allowing even grounded bitter medicine frogs to reach their victims’ mouths seconds after attaching to their legs. More mercenary druids employ the plants as weapons against their foes, welcoming the replacement of flesh-and-blood humanoids with a fresh patch of bitter medicine frogs.