
breithauptclan |

Critical hit from Attack of Opportunity.
And the Mage Hunter feat for a Superstition Instinct Barbarian.
Those are the ones that I am aware of.

thenobledrake |
A critical hit with an Attack of Opportunity can disrupt spells that provoke attacks of opportunity when they are cast.
Further there is a fighter feat called Disruptive Stance makes concetrate action provoke and also disrupts concentrate and manipulate actions (so spells being cast or sustained) on a hit rather than a critical hit.

HumbleGamer |
There are some:
- Attack of opportunity ( On critical Hit )
- Fighter Disruptive Stance ( On Hit )
- Mage Hunter ( On critical Hit )
- Distracting Explosion ( Unstable use, on a Hit ) - Works only with Verbal Components.
Other tools that might ( it's a check ) disrupt spellcasting are
- Stupified Condition
- Grabbed/ Condition
- Attacks like the barbarian "silencing strike"
but there's more out there I guess.

HumbleGamer |
HumbleGamer wrote:But only in combination. Very few spells trigger an AoO by themself.There are some:
- Attack of opportunity ( On critical Hit )
- Fighter Disruptive Stance ( On Hit )
Obviously the disruptive stance ( as most of the fighter stances ) relies on the reaction ( AoO in this case ).
That said, all spells with somatic trait has the manipulate traits, and because so triggers AoO.
Spells with the verbal trait gain the concentrate trait, which is the trigger for the Disruptive stance. Note that everything involving verbal stuff ( demoralize, bon mot, etc... ) has the concentrate trait.
So, Let's consider 3 different spells here:
1) Shield Cantrip(V): Triggers AoO if the character is using Disrupting Stance.
2) Life Boost(S): Triggers AoO ( doesn't have any effect on the Disrupting Stance, since it only has somatic trait ).
3) Fireball(S,V): Triggers the basic AoO and also let the disruptive stance work, having either Verbal and Somatic traits.
Everything else seems pretty specialized.
Yeah, the rest is mostly class/spec related.
But consider that any class can get AoO by lvl 6, so if you want to deal with spellcaster, is not a great deal.
Obviously, interrupting is meant to be something exceptional, so not on demand. Or else spellcaster would be annihilated.

breithauptclan |
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Everything else seems pretty specialized.
Wait, what were you expecting?
Shutting down the bulk of the contribution ability of many different classes isn't something that gets handed out to just anyone. It is going to take some pretty specialized build investment to be able to prevent spellcasters from casting or sustaining spells.

_benno |
2) Life Boost(S): Triggers AoO ( doesn't have any effect on the Disrupting Stance, since it only has somatic trait ).
The somatic trait adds the manipulate trait. And per Disrupting Stance manipulate actions are disrupted on a hit.
Furthermore, you disrupt a triggering concentrate or manipulate action if your Strike hits (not only if it’s a critical hit).

HumbleGamer |
HumbleGamer wrote:
2) Life Boost(S): Triggers AoO ( doesn't have any effect on the Disrupting Stance, since it only has somatic trait ).
The somatic trait adds the manipulate trait. And per Disrupting Stance manipulate actions are disrupted on a hit.
Core Roolboke pg. 150 wrote:Furthermore, you disrupt a triggering concentrate or manipulate action if your Strike hits (not only if it’s a critical hit).
Nice catch there.
One of the most awesome stances ever \o
HumbleGamer |
HumbleGamer wrote:
- Grabbed/ Condition
Restrained is effective. Which you get from a critical success in grappling.
That stops most spells but there are a few exceptions depending on the spells action requirements.
Both are effective.
As I wrote beofre making the list
Other tools that might ( it's a check ) disrupt spellcasting are
meaning that some skills/tools give a flat check for the opponent, not to lose the spell.
Restrained is the critical success of a grapple move, which forbids the user from casting somatic spells rather than giving a flat check 5+ dc.

Starocotes |

Thanks a lot for all these answers. That really clears up some things.
So far it is not really that hard to stop someone from casting but it gets harder to stop someone from sustaining a spell once it is cast.
Sustaining doesn't get the manipulate traits from components and so you can do that even if you grabbed of constrained.