By adding an unexpended Spell Dynamo to your Bomb (and thus expending the dynamo's spell slot), you can change it into an Arcano Bomb. An Arcano Bomb deals Force damage instead of Fire damage, all of its damage dice are d12s, and it deals an extra 1d12 Force damage.
Arcano Bomb [Formula]
Raw data
{
"name": "Arcano Bomb [Formula]",
"level": 6,
"__prop": "subclassFeature",
"header": 2,
"source": "ValdaSpire24",
"entries": [
"By adding an unexpended Spell Dynamo to your Bomb (and thus expending the dynamo's spell slot), you can change it into an Arcano Bomb. An Arcano Bomb deals Force damage instead of Fire damage, all of its damage dice are d12s, and it deals an extra {@damage 1d12} Force damage."
],
"className": "Alchemist",
"classSource": "ValdaSpire24",
"subclassSource": "ValdaSpire24",
"subclassShortName": "Dynamo Engineer"
}