Epic Clash: Necrotic Energy vs. Behemoth

a black and green bolt of necrotic energy streaks toward a creature of your choice within range. Make a ranged spell attack against the target. On a hit, the target takes 4d6 Necrotic damage, and the next attack roll made against this target before the end of your next turn has advantage, as the target is momentarily enveloped in an aura of decay that weakens its defenses.