Anti-Magic Zone places a ground-targeted shadow barrier that reduces magic damage taken by allies standing inside it. The zone is fixed where it lands, so the raid must stack into it for the absorb to matter.

It is situational because both conditions need to hold: the raid has to be able to stack on the zone, and the incoming damage has to be magic.

The base cooldown is 4 minutes and can be reduced to 3 minutes with Assimilation, which also extends the duration from 6 to 8 seconds.

Assign on telegraphed magic damage windows where the raid is stacked or can be stacked onto the zone. Avoid physical damage events, since the absorb does nothing there.