All of them. His very existence is an affront to the fabric of reality.

Thank you!

I appreciate the thanks but I will not return it. Because fuck you, Erebus.

Your hate is my pleasure...

Hey my existence is too.

Killing the actual Erebus and stealing his identity just because his mother told him to be more like Erebus.

Even Erebus hated Erebus!

What he did to my boy Argel Tal

His Birth

The one the definitely made me despise him the most was when he appeared as Sejanus and tricked Horus during that warp vision.

Murdering Argel Tal. Never forget. Never forgive.

Amen to that!

Argh I hate that guy

Fuck that guy!

him

Everything. r/fuckerebus proves this.

When he convinced Horus to join Chaos.

Ah, that was a precious and delightful moment...

I bet it was

Madlad

Erebus invented alcoholism.

Fuck Erebus!!

Being born

Having part of Tarik’s soul be possessed by the demon Tormaggeddon in KNF…

When he was born.

Existing

Argol Tal