Synaptic Wildfire

You touch a creature and open up its neural pathways to enable a more effective use of its mind to process information.

The target has advantage on Intelligence checks, a +2 to initiative, and it gains an additional action on each of its turns. That action can be used only to perform a wisdom check or an intelligence check.

When the spell ends, the target can't move or take actions until after its next turn, as the mind is overwhelmed and struggling to return to normal. 

At Higher Levels. When you cast this spell using a spell slot of 4rd level or higher, you can target one additional creature for each slot level above 3nd.