Red Dragon Rune

When you hit a creature with an attack using a
weapon, you can invoke the rune to summon
fiery shackles: the target takes an extra 2d6 fire
damage, and it must succeed on a Strength saving
throw or be restrained for 1 minute. While
restrained by the shackles, the target takes 2d6
fire damage at the start of each of its turns. The
target can repeat the saving throw at the end of
each of its turns, banishing the shackles on a
success. Once you invoke this rune, you can't do
so again unti