There is a Legacy version
here.
Expanded Splash Feat 12*Alchemist Source Player Core 2 pg. 67Archetype Demolitionist* This version of the Expanded Splash feat is intended for use with an Archetype and has a different level for access than the
original feat.
You can throw bombs at just the right trajectory to create especially large and powerful explosions. When you throw an
alchemical bomb and that bomb has the
splash trait, you can have the splash damage affect all creatures within 10 feet of the target instead of 5 feet. If you do, you gain a status bonus to the bomb's splash damage equal to your Intelligence modifier. If you have the bomber 5th-level field discovery, this additional damage applies even if you caused your bomb to deal splash damage equal to your Intelligence modifier instead of the normal amount, allowing your bombs to deal splash damage equal to double your Intelligence modifier.
Archetype Use
This feat can be used for one or more Archetypes in addition to the listed Classes. When selected this way, the feat is not considered to have its class traits.
Expanded Splash Leads To...
Controlled Blast,
Mega Bomb