Netherstone Trait

I just got a netherstone with the trait “Apostle of Water”. I can’t seem to find it anywhere in the traits list. Does anyone know about this one or am I just missing it somehow?

Apostle of Water
At the start of this creature’s turn, it increases your other creatures’ Intelligence by 15% of this creature’s Intelligence.

Copied from the trait compendium spreadsheet.

Thanks again! I hadn’t seen this sheet before.