toxic bombs with explosive bomb discovery

[bathik]

so i just started playing a fumigant archetype alchemist in a pure steam setting game.

if i take the explosive bomb discovery and use a inhaled poison do i affect a 20' radius or a 15' ?

does the directed bombs discovery make my inhaled poison a 30' cone ?

[Tyrant Lizard King]

It's true that it's unclear but rules usually specify when things stack.

For Explosive Bomb, the wording says splash radius in "increased to 10ft" not "doubled" or "increased by 5ft". Using an inhaled poison is already a 10ft radius so the only benefit from that discovery with an inhaled poison would be the "catching fire" aspect.

Similar to the Explosive Bomb discovery, Directed Bomb would still be a 15ft cone due to it's wording. The discovery assumes a 5ft blast radius and the class ability you're using is 3PP.

That being said, your GM could very easily allow you an increase to those discoveries when using an inhaled poison and if so, more power to you! Otherwise, I would recommend using different discoveries with your inhaled poisons. Contact poisons would be the way to go in my opinion.