I think I know how the cantrip works, but since I had a discussion with our group last session about it, I want confirmation from other people
so with the shield cantrip you
1. Need to cast it on your own turn to work, either as just a AC bonus or to use Shield BLock
2. no matter if the damage exceeded the Shields Hardness or not, if you use the cantrip Shield for the Reaction Shield Block, it is gone, it doesn't stay around, you can't recast it, that's it for the next 10 minutes
am I correct with this, or am I missing anything important?
Because the Gm argued since, the damage didn'T "shatter the shield" it would stay around, and the enemy could still use it next turn. (without even spending an action for casting it, but that is another conversation)
1. yes you have to cast it on your turn - additionally you have to raise it to gain access to the reaction -> that makes two actions to use the shield block in the first turn you use it and one action to raise the shield later on if he does not use the cantrip
2. yes the shield is gone after the use no matter how much damage
Tell your gm to read the spell again 5 times in a row, out loud word for word and if he still believes he can cheat you smack him against the back of his head :P
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1. yes you have to cast it on your turn - additionally you have to raise it to gain access to the reaction -> that makes two actions to use the shield block in the first turn you use it and one action to raise the shield later on if he does not use the cantrip
This is outright wrong. Shield lasts only one round so you can't pre-cast it. Casting it also INCLUDES the Raise a Shield action, so it's only one action to cast, get the +1 AC bonus AND the Shield Block reaction.
Tell your gm to read the spell again 5 times in a row, out loud word for word and if he still believes he can cheat you smack him against the back of his head :P
You might want to take your own advice, friend ;)
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1. yes you have to cast it on your turn - additionally you have to raise it to gain access to the reaction -> that makes two actions to use the shield block in the first turn you use it and one action to raise the shield later on if he does not use the cantrip
2. yes the shield is gone after the use no matter how much damage
Tell your gm to read the spell again 5 times in a row, out loud word for word and if he still believes he can cheat you smack him against the back of his head :P
I'm sorry,. but this post is wrong in so many ways.
Core Page 286 - "You raise a magical shield of force. This counts as using the Raise a Shield action..."
Doesn't sound like it takes an extra action to raise the shield. Casting the spell (1 action) gets you the +1 AC for a raised shield.
Also, your comment about "to use the shield block in the first turn" makes little sense as the shield only lasts until the start of your next turn (i.e. only lasts one turn) - you recast it each turn (subject to the 10 minute wait if you actually use it to block damage).
Last the shield is not gone after "the use", it is gone after you use the Shield Block reaction with the shield (and cannot be cast again for 10 minutes). If you never use Shield Block, you can cast the spell every round to get the +1 AC.
So, to answer the OP's questions:
1. Yes, you cast it on your turn and receive a "raised shield" that provides a +1 AC (total of ONE action). As a raised shield, you can during your turn (if you wish) use a REACTION to shield block.
2. As stated in the spell: "After you use Shield Block, the spell ends and you can't cast it again for 10 minutes." The trigger to end the spell has nothing to do with damage blocked... the trigger is using the Shield Block reaction. So, if you block, the spell ends.
Ninja'd by my long post!