"The battlemages on that island were tough, our counter-casters paid dearly to undo their magicks...."
As an action, a player with the ability to cast a spell may expend a spell slot to gain a flow of magic essence. This flow lasts until a spell the caster casts is reacted to by the spell Counterspell, or until the caster finishes a short or long rest. If the caster casts a spell that is targeted by the Counterspell ability while they have a flow of magic essence active, they may choose to expend the flow of magic essence to roll a number of d4s equal to the spell slot used in gaining it divided by 2 (minimum 1d4). The resulting number + 10 is the spell save DC that the counterspeller must defeat using their spellcasting ability modifier, or the counterspell fails. If the Counterspell would already require a spellcasting ability check due to a disparity between the level of Counterspell and the level of interrupted spell, the total of the d4s rolled is added to the DC.
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