Sacred soil & Shadow Flare are incompatible

[Rhindas]

Technically it's because they occupy the same "buff" slot; putting either spell up gives you a buff of the same name for its duration. At first glance you'd say that was an oversight, but it's been this way since the beginning, and since it makes no sense to have a "buff" for Shadow Flare, and since they've made exactly zero changes to it since its inception, I'm going to say this is intentional and was made a buff so as to ensure they are mutually exclusive.

I do not recall the tooltips mentioning they are mutually exclusive at any point, however.

[sanosuke001]

The tooltips definitely should define their exclusivity.