
Thazar |

Causing damage and attacking is what breaks invisibility. Casting Fireball would indeed break the spell.
Since a rogue who is invisible gets sneak attack for the first attack... I would say a wizard does not appear until the exact moment the spell is cast. So you show up right away... but to late for someone who could not detect you while invisible can try and disrupt your spell. Other may have another opinion on this part of your question as it could be a bit of a gray area.

Nixda |

From reading the rules invisibility is as much of a gray area with casting as with a rogue's sneak attack, but sometimes a different scenario - if a rogue attacks at the beginning of combat (out of stealth or invisibility) her target is usually flat footed and therefore a sneak attack victim for all of the rogues attacks in that round. If a rogue manages to stealth and/or is invisible (not "greater invisible") in combat it becomes quite a bit more muddled - has this already been clearly ruled?
In the case of invisibility, whether an attack-by-spell is constituted by starting to cast it or by the spell's effect manifesting is perfectly unclear. Heck, they even say "Exactly who is a foe depends on the invisible character's perception." - what is THAT supposed to imply?
For what it's worth, in my games an invisible caster gets off one spell (so no AoOs) before turning visible.

wraithstrike |

From reading the rules invisibility is as much of a gray area with casting as with a rogue's sneak attack, but sometimes a different scenario - if a rogue attacks at the beginning of combat (out of stealth or invisibility) her target is usually flat footed and therefore a sneak attack victim for all of the rogues attacks in that round. If a rogue manages to stealth and/or is invisible (not "greater invisible") in combat it becomes quite a bit more muddled - has this already been clearly ruled?
In the case of invisibility, whether an attack-by-spell is constituted by starting to cast it or by the spell's effect manifesting is perfectly unclear. Heck, they even say "Exactly who is a foe depends on the invisible character's perception." - what is THAT supposed to imply?
For what it's worth, in my games an invisible caster gets off one spell (so no AoOs) before turning visible.
If you drop accidentally hurt a party member I don't think that constitutes an attack.
As an example if a party member is hurt, and you try to cure them, but they are for some reason hurt by positive energy it should not break the spell, but if you intentionally use a cure spell on an undead in order to harm them then that should constitute as an attack.
In short I think intentional harm is the key here.

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If you are invisible and you cast a spell (for this example lets say fireball) when do you become visible?
Do you appear as you begin casting or do you appear right as your spell goes off?
You become visible when you choose the spell's target, which you do at the end of its casting time. Before that, it's not definitely established that you're making an attack. You could still cast the fireball into an unoccupied area.

wesF |

Great. I ask because we recently fought a creature that became invisible. We were all holding our actions saying we would attack when it reappeared. The question arose does the spell go off or do we hit the creature the second he begins to cast?
Thanks for the replies.
I would say it happens in this order
Spell goes off
invisibility breaks
characters get free shots