I know the question about casting in a form is in multiple threads and the normal answer is because of this rule:
If you take on a battle form with a polymorph spell, the special statistics can be adjusted only by circumstance bonuses, status bonuses, and penalties. Unless otherwise noted, the battle form prevents you from casting spells, speaking, and using most manipulate actions that require hands. (If there’s doubt about whether you can use an action, the GM decides.) Your gear is absorbed into you; the constant abilities of your gear still function, but you can’t activate any items.
*I always read the main reason is the Verbal component*
What if you have the Level 12 Feat "Blood Component Substitution"? Use the Dragon Form as the example here so the "manipulate" trait wouldn't be a problem because you have hands.
You can bypass the need for incantations and gestures by drawing energy directly from your blood, causing you to visibly glow the color of your blood and crackle with magical energy. When you Cast a Spell, you can replace all verbal, material, or somatic spellcasting components with a blood component. To use a blood component, you lose Hit Points equal to twice the spell's level as the energy in your blood is depleted, and you can't decrease the Hit Points lost in any way. As usual for altering components, this has no effect on the number of actions required to Cast the Spell, and your Cast a Spell activity gains the concentrate trait but not the manipulate trait. You can't use blood components to replace any required part of a spell's cost.
*Another question*
What if you have an innate cantrip from something like Arcane Tatoo?
Monsters can innate spells and the feeling from reading the rule, the innate cantrip should work when in a form?
Thanks!
