Rune Strike

Rune Strike is a Death knight ability, taught at level 67 for. It is an instant weapon strike that is usable while in Blood Presence or after avoiding an attack. This makes it the Runic Power dump for tanks instead of Death Coil, but it also usable by damage dealers when for example, a rogue pops Evasion or a hunter Deterrence as it still bypasses the extra avoidance. The damage done causes considerable bonus threat.

As you get 1 dps per 14 AP, Normalization speed for two-handed weapons is 3.3sec, and it also does 15% AP in damage, making the total AP coefficient of this ability 38.57%, it scales hugely.

Tips and tricks

 * When tanking a group of mobs, make sure to switch target frequently so that not all of your Rune Strikes hit the same target. Switching to a new target after landing a Rune Strike will help you build more threat on all of the mobs. Most of the time your Death and Decay will take care of a lot of threat, backed up by Heart Strike or maybe Blood Boil, but sometimes dps still need more threat than your runes can cover.
 * Rune Strike causes more threat (and outright damage) per point of runic power than Death Coil, so there is no place for Death Coil in a DK tank rotations, except possibly for a ranged pull.