Hideous Laughter

[Atalius]

I noticed the duration is Sustained.

Critical Success The target is unaffected.
Success The target is plagued with uncontrollable laugher. It can't use reactions.
Failure The target is slowed 1 and can't use reactions.
Critical Failure The target falls prone and can't use actions or reactions for 1 round. It then suffers the failure effects.

So does that mean say the enemy fails its save, the target is slowed 1 and can't use reactions, if I sustain the spell on my next turn and the following rounds will it keep the "Slowed 1 and can't use reactions" going?

[Xenocrat]

Yes.

[shroudb]

Yes.

it's an incredibly powerful spell, that a lot of times it's worth sustaining even if they made their save, depending on what you're fighting.

[Atalius]

Woohoo! Finally something I can get behind. After Demoralize was incredibly disappointing to me.

[Atalius]

So if the enemy critically fails he's basically done as long as I keep sustaining the prone condition?

[HammerJack]

No. The critical fail effect lasts one round, then you're sustaining only the fail effect.

[Xenocrat]

The “no reactions” alone is worth the price of admission on some tough bosses who can otherwise gut one party member every turn.

[WHW]

Denying dragons and other bosses their reactions is no laughing matter indeed.

[HammerJack]

And since this doesn't have the incapacitate trait, it's a level 2 spell that can be useful against bosses forever.