This spell is for players who use a Wizard class or any Wizard subclass.

Scream "You stupid ____________"! (The caster fills in the blank and the phrase must remain the same, otherwise the spell does not trigger) and drain your brain to get swoll. 

Lower base Intelligence and Intelligence modifiers to 0. Add all Intelligence and Intelligence stats to base strength and half Intelligence to strength modifier. Roll 2D20 and add to damage dealt to target creature using new strength stat and strength modifier stat.  

After the time limit ends the caster is effectively braindead until eight long rests have been completed. The player character is also unable to speak using proper language and instead babbles unintelligibly until recovered. Every so often (at the DM's discretion), the player loses control of their limbs and may strike a party member or NPC while in recovery. If this happens, the PC or NPC must pass an acrobatics saving throw to avoid damage. Should the party have a cleric or other healer/support class, that character may use a healing spell to halve the recovery time.