A dragons Breath Weapon would be considered a Magical effect correct? For Shadow Syphon purposes.
Yes, it has the "arcane" trait which means it's magic.
How do you know what level the Breath Weapon is, let's say you have a level 5 Shadow Syphon and your fighting an Ancient Red Dragon.
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How do you know what level the Breath Weapon is, let's say you have a level 5 Shadow Syphon and your fighting an Ancient Red Dragon.
If an effect is a spell, its level is the counteract level. Otherwise, halve its level and round up to determine its counteract level. If an effect’s level is unclear and it came from a creature, halve and round up the creature’s level.
Since the breath weapon is not a spell, we use half its level rounded up as the effect level. Since an Ancient Red Dragon is a level 19 creature, its Breath Weapon is a 10th-level effect. A level 5 shadow siphon can just barely counteract it on a critical success (the DC is either 39 (the DC for a 10th-level effect) or 42 (the DC of the breath's Reflex save), depending on your interpretation of the rest of the counteract rules)
Interesting thank you! Does anyone know if the reaction would be used after the damage was dealt or immediately just as the breathe is about to deal damage?
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Interesting thank you! Does anyone know if the reaction would be used after the damage was dealt or immediately just as the breathe is about to deal damage?
I assume you are asking if you get to know the damage first? The answer is yes. The trigger is "A spell or magical effect deals damage.".
You have to figure out how much damage there is before it can be dealt.