Acid Spray: A spray of acid erupts from your outstretched hand, dealing 1d6 points of acid damage per caster level (maximum 15d6) to each creature within its area (Reflex half). This acid continues to burn for 1 round, dealing 1d6 points of acid damage per two caster levels (maximum 7d6) to any creature that failed its saving throw against the spell (a second Reflex save on the creature's turn negates this additional damage).
My question is: If a spellcaster fails his Reflex save vs this spell and takes the initial damage, and then on his turn wants to cast a spell of his own, does he add 1/2 the damage he took to his concentration check as if it was continual damage? He is supposed to roll another Reflex save on his turn. If he fails that, does he take the 2nd part of the damage at that time or on the Acid Spray caster's turn?
The spell is listed as an instantaneous duration spell, but then it says it can have a duration of 1 round with a failed Reflex save as it "continues to burn". If it does count as continual damage, does he add 1/2 of the initial damage he just took to his concentration check, or half of the secondary damage, or none of it?
Thanks
Maybe no one was up later last night to suggest an answer, so I'll bump this in hopes that someone will give it a try.
Thanks
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William the 10th level wizard casts Acid Spray on Sam the sorcerer:
On Willaim's turn he casts the spell, rolls 10d6 for 40 HP damage. Sam tries to make a REF save but fails, so he takes all 40 HP. He survives.
On Sam's turn he must first attempt a new REF save at the start of his turn because of the ongoing acid damage. If he succeeds, he takes no more damage and he can cast a spell without any problem (no Concentration Check at all because he took no damage this turn). If he fails this REF save, he takes 5d6 damage at the start of his turn from the ongoing acid effect.
Let's say he fails and rolls 16 on the 5d6 so Sam takes 16 HP damage at the start of his turn (total of 56 HP, 40 on William's turn and 16 on Sam's turn). Now he wants to cast Disintegrate on William. He will need to attempt a concentration check because "If you are taking continuous damage, such as from an acid arrow or by standing in a lake of lava, half the damage is considered to take place while you are casting a spell." The DC for this will be 18: 10 + 1/2 the damage he took on his turn (16) = 10 + 8 = 18. Note that the initial 40 HP happened on William's turn and is not part of the continuous damage and not counted into the DC of Sam's Concentration check). If Sam fails this check, then he fails to cast Disintegrate (but loses the slot anyway). If he makes the check, he successfully casts his Disintegrate.
Hope that clears it up.
Side note: It's "Instantaneous" because all the magic happens instantly, the same as Fireball or Lightning Bolt. After the magic is gone (instantly), there is nothing left to dispel, but that doesn't mean the acid goes away instantly. So the caster instantly creates a spray of acid that damages affected targets and then there is no more magic, but he acid is still there for a round and might do more damage next round - but nobody can dispel this acid because it's real acid rather than being an ongoing (non-instantaneous) spell effect.
Awesome, DM_Blake! Thanks for the detailed answer. It is as I thought, but wanted to make sure.