[quote=@Crimson Raven]
<Snipped quote by Caits>

How about, once activated, the lacrima uses a null magic to cancel or weaken all magic in an area. However, it only can be activated for a certain amount of time and only has a certain amout of magical power to cancel, one exausted it reqirers time to recharge.
[/quote]

Because it's the GM's "stop an unnecessary fight until later" tool perhaps?