How did Eren activate founding Titan in Attack on Titan?

titan season 4 episode 20 reaction attack on titan season 4 episode 20 reaction mashup grisha yeager founding titan grisha yeager backstory

TITAN WITHIN HER HER HARDENED STATE WAS UNDONE BY THE POWER OF THE FOUNDING TITAN , WAKING HER FROM HER FOUR YEARS OF SLEEP HOLDS THE CART TITAN WITHIN

references Do you know how many Colossal Titans were dispatched when Eren launched the Rumbling Destruction? 13 baigeidedongman · Survey Corps first person

attack on titan 2 This is Eren on The Founding Titan Form Inspired by Attack On Titan Video of the Timelapse: D0QbY_d1I9A