Boreal Strike

Your weapon emanates a misty cold aura of subtle and scintillating colors, freezing all in its path.

As part of the action used to cast this spell, you must make an attack with a weapon, causing that weapon to emit dim light out to a range of 5 feet. On a hit, the target suffers the attack's normal effects, takes an extra 1d6 cold damage, has its speed reduced by 10 feet , and any movement in any direction provokes an attack of opportunity, even if it attempts the disengage action, until the start of your next turn.

This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).