Most damage dealt by a single spell in Hearthstone

Most damage dealt by a single spell in Hearthstone
Who
KaptVoorvel, Plank
What
171,933,298,944 total number
Where
Not Applicable
When
20 September 2015

On 20 September 2015, Hearthstone players Plank and KaptVoorvel set up a match between Priest and Paladin with the goal of dealing the most damage possible in a single turn. With seven copies of Prophet Velen on the Paladin side of the field, a spell dealing 1,343,228,898 damage was then doubled seven times to become 171,933,298,944 damage – the most ever dealt in a single Hearthstone turn.