Server crash when using Ars Noveau ranged projectile spell in fight against Ghast
The spell I was using using is the following sequence:
[Projectile][Harm][Amplify][Cut][Amplify]

I can reliably reproduce this by timing the harm spell as the ghast fires, almost as if I was going to reflect his fireball back. The whole server crashes and users get disconnected

It appears that the Cut spell specifically is responsible for this crash