World creation at will. To be able to create you own universe the way you like it, share it with others, sink in it like you were one of the inhabitants while forgetting your own original self then return to being your original after a time period or at a trigger event (maybe death of that "character").
Kind of a God ability. Also grants you every technology if you want since you can even create you own rules by makeing your own universe. Wanna live the life of your favourite movie hero? Even that is possible. Wanna time travel? Just create a world that allows time traveling. Copy ideas from other creators so you have like infinite ideas to try, combine and experience.