I'm working on some 'Biotherapy' creatures for my Monstrumologist PrC
. So far have the:
Fine Magical Beast (swarm)
2d10+2 (13 hp)
Fly 20 ft. (good)
22 (+4 dex, +8 size), touch 22, flat-footed 18
Swarm (1d6 plus disease)
Swarm (1d6 plus disease)
Beneficial infestation, darkivision 60 ft., immune to weapon damage, scent, vermin traits
Fort +5, Ref +4, Will +0
Str 1, Dex 19, Con 12, Int -, Wis 11, Cha 1
Swarm or Business (2-30 swarms)
These appear as silvery blowflies, with an almost pleasant, musical buzzing as they swarm around one another.
Purefly swarms are specially bred blowflies for the production of therapeutic maggots. Their ancestors treated to frequent bursts of positive energy, they became a new species capable of reproduction. They seem to have a sixth sense when it comes to necrotic tissue, detecting it much farther than can a normal blowfly.
Pureflies swarm the undead and those with necrotic tissue, laying thousands of eggs and infecting them with their rapidly hatching maggots.
Detect Death (Ex)
: Through both scent and other inherent senses, a purefly swarm can detect those with necrotic tissue out to 100 feet. They can pinpoint their exact location within ten feet.
Beneficial Infestation (Ex)
: The disease of a purefly swarm is beneficial to most creatures, confusing spells that heal. There is 50% that a spell that would cure those of maggot therapy is unaffective.
A creature with necrotic tissue, such as damage from negative energy damage or being undead, must succeed on a DC 12 fortitude save or be infected with Maggot Therapy (incubation period 1d4 minutes). They are infested with thousands of eggs if they begin their round within a purefly swarm. Undead take 1d4 Strength damage per minute as the maggots begin feeding ravenously and releasing tiny sparks of positive energy. Living creatures are instead healed of 1 point of negative energy damage per round, and gain an immediate save against any other disease they may have (except maggot therapy). Living creatures can choose to voluntarily fail their fortitude save. The save DC is Constitution-based.
Any undead creature vulnerable to a purefly swarm's damage that begins its turn with a swarm in its square is nauseated for 1 round, ignoring an undead creature's normal immunity to nausea and Fortitude-based saves; a Fortitude save (DC 12) negates the effect. Spellcasting or concentrating on spells within the area of a swarm requires a Concentration check (DC 20 + spell level). Using skills that involve patience and concentration requires a DC 20 Concentration check.
A purefly swarm gains a +4 racial bonus to spot checks.