I've been actually considering creating a prioritized Necrotic Strike spam sequence.

It would do the following

Necrotic Strike x4 + Empower Rune Weapon + Necrotic Strike x 4 = 8 x Necrotic Strike from a single DK.

Multiply that by 4 Dks, that is 8 * 4 = 24 total. That is a ton of backloaded DPS.

Once finished, do your DPS burst macro and try to kill the target.