Invisibility question

[azmodean]

yea, what uzaki_akimbo said, in short, the spell itself is not the issue, the issue is that the invisible spellcaster dropped a "damage-causing object" on the PCs (sounds like an attack to me)

By this thought process, the lvl 9 spell meteor fall (I think that's the name) from complete divine would not break invisibility either, as all you are doing is conjuring a large rock that just "happens" to fall on your enemies.

Concerning the original question, if you are invisible and set for charge, and an opponent just happens to run into your spear, it doesn't break invisibility, but the weapon gets an attack with a bonus equal to its enhancement bonus, none of your feats, ability bonuses, or bab apply to the attack.
I would consider this action to be setting up a makeshift trap.

 

[npiccini]

I would tend to agree with your DM's revised opinion that the dropping of the coin would in fact render you visible. I think in some ways, and maybe im being presumptuous based on my own campaign, playing with this grey area of when you become visible or not really opens up the flood gates to effectively making invisibillity as powerful as greater invisibility or at least rivaling it in power. I tend to rule on the side of caution in most cases, but thats just me. I certainly dont mean that in a slight to how someone else might rule in their own game, im a firm believer in the earlier opinion that I like to balance the playing field between what the PCs and the NPC's have available to them. Im not one of those "im the DM, so like it!" I also agree strongly that this is the kind of question that doesnt have an easy answer because there is always another step that the player can push the envelope for a ruling. For example, someone's earlier example about turning a moving fence invisible and all that stuff......it just goes on and on.

Play on everyone, and be good to each other!