
Pig #1 |

Looking for constructive feedback on this one. Is it balanced? Does it seem reasonable?
Venomsoul
A venomsoul recognizes that her body is the ultimate source of alchemical toxins. By conducting unending experiments on her own poisonous anatomy, she is able to develop far deadlier concoctions for her enemies to imbibe. A venomsoul has the following class features:
Venom Surge: At first level, a venomsoul discovers a way temporarily heighten the poison within her own body. Over a period of one hour, the venomsoul can choose increase the potency of the poison in her veins. Once the enhanced toxin has been prepared, it lasts until the next time the venomsoul uses her toxic racial ability. For the duration of that use of toxic, the venomsoul gains a +4 alchemical bonus to Constitution, as well as a +2 moral bonus to all weapon attacks made using the enhanced venom. This ability replaces mutagen and all mutagen-related discoveries and class features.
Plentiful Toxin: At 3rd level, the venomsoul gains an additional daily use of their toxic racial ability. At 9th level and again at 14th level, the venomsoul gains one more daily use of toxic. This ability replaces swift alchemy and instant alchemy.
Poison Immunity: At 5th level, the venomsoul is immune to all poisons. This ability replaces poison resistance.
Poison Bomb: At 10th level, the venomsoul gains poison bomb as a discovery even if they do not meet the prerequisites. This ability replaces the discovery they would normally obtain at that level.

Vindicator |

The Venom Surge could use some more balancing out. Mutagen grant +4 to CON, +2 natural armor bonus, and -2 to CHA for ten minutes. Your alternative grants +4 CON and +2 to attack with no specified time limit. Consider this instead: +4 CON, +2 to attack, -2 WIS for ten minutes. Justify the wisdom penalty as the venomsoul make the drinker a little reckless and mad with power.
Also, try your hand at creating replacement discoveries to make up for the ones lost by the archetype.
Good stuff.

Pig #1 |

The wisdom penalty works for me, although because the venomsoul is a vishkanya the poison is already in their body, meaning they don't need to drink it. Still, the poison build-up and the sudden increase in body toxicity would probably hinder their judgement.
I'll also start brewing (Ha, alchemist joke) some new discoveries to make up for all the mutagen-based ones.

Pig #1 |

For flavor reasons I would rather have no armor bonus and no Wis penalty. The venom is working internally, making it easier for the character to bounce back from injury (hp) and resist poison and disease (fort saves), but would it cause her to suddenly grow scales?
Vishkanyas already gain their HD as a bonus on saves against poison, and this class gains poison immunity at level 5, so pumping saves would be redundant. The CON bonus represents the venomsoul's boy going into overdrive in order to process more intense toxins. I think the WIS penalty makes sense given the sudden rush of poison that would be deadly to others.
Having some trouble with converting grand mutagen and greater mutagen into new discoveries. A direct analogue just doesn't seem to make sense flavor wise, especially because I can't think of a second ability score to increase.