Once you have the Elemental Invocation gem in your inventory, you can drag it to an open slot in your Skills menu. Then, insert a spell into one of the open sockets and activate Elemental Invocation.

Eldritch invocations define warlocks, granting various benefits and skills not found elsewhere in D&D. Pact of the Tome and Blade, along with Fiendish Vigor, are must-have invocations for warlocks ...

The Chicago City Council, like many other legislative bodies, typically opens meetings with an "invocation"—essentially, a prayer or moment of reflection. Clergy from a wide range of religious ...