Effect one swarm of poisonous frogs
This spell functions as summon swarm, except you summon a swarm of poisonous frogs. This swarm has the statistics of a centipede swarm, except it has the animal type and its poison deals Constitution damage instead of Dexterity damage.
Putting it all together…
To save you the effort of looking up 5 different things, the wording (if combined with summon swarm) would be:
Casting Time 1 round
Components V, S, M/DF (a square of red cloth)
Range close (25 ft. + 5 ft./2 levels)
Effect one swarm of poisonous frogs (see below)
Duration concentration + 2 rounds
Saving Throw none; Spell Resistance no
You summon a swarm of poisonous frogs, which attacks all other creatures within its area. You may summon the swarm so that it shares the area of other creatures. If no living creatures are within its area, the swarm attacks or pursues the nearest creature as best it can. The caster has no control over its target or direction of travel.
And here is a complete stat block for a poisonous frog swarm:
Poisonous Frog Swarm
AC 18, touch 18, flat-footed 14 (+4 Dex, +4 size)
hp 31 (9d8–9)
Fort +5, Ref +7, Will +3
Defensive Abilities swarm traits, Immune weapon damage
Bite—injury; save Fortitude DC 13; frequency 1/round for 6 rounds; effect 1d4 Con damage; cure 1 save.
The save DC is Constitution-based and includes a +2 racial bonus.
*Special Notes on the Stat Block: If this were truly an “animal” instead of vermin (as centipede would be) there would be many other changes to make as well. However, the spell simply says to use the centipede swarm with the following changes…” so only the changes indicated in the spell have been applied.
Pathfinder Roleplaying Game: Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.