@JeremyECrawford Can I end concentration (on a spell) on another character's turn (without Ready action), or do i have to wait my turn?
— Josu (@mrgobo) February 29, 2016
"You can end concentration at any time (no action required)" (PH, 203). #DnD https://t.co/YfH7a1VnXy
— Jeremy Crawford (@JeremyECrawford) February 29, 2016