Originally Posted by
Tehr
Bonestorm is a waste of RP compared to Death Strike in almost all high end content, unfortunately. It's a healing loss in single target (or even in AoE when faced with lots of damage, since BS doesn't scale with damage taken as DS does) and it's only a minor damage increase in either scenario, and can be considered overly risky. Unless you're running trivial content with AoE damage (such as low dungeons), Blood Mirror is arguably the only viable T100 talent.
Logically, Runic Power is a direct conversion to healing through Death Strike; thus, overcapping RP is the same as overhealing, except it's also a DPS loss (because DS deals damage AND heals). Because any RP gained above cap is a waste of DPS and Healing, it's more efficient to "waste" a Death Strike by overhealing to prevent a cap than to Heart Strike and gain more RP than you can hold. ALSO, the major reason you're emphasizing HS when in Death and Decay is because of Heartbreaker (as Heart Strike damage is pitiful), and if you're overcapping RP, you're wasting the benefit of Heartbreaker. In any scenario, you should only Marrowrend when at or below 6 stacks (assuming you have the 1 point trait in your artifact), regardless of health lost due to Foul Bulwark.
There are a lot more factors that come into it, of course. Because DKs don't lose DPS (or at least not much) when they have at least three runes recharging, you can safely sit at <125 RP, 1 Blood Boil, and 3 runes for ~5 seconds (dependent on your Haste) to wait for damage to come in (obviously there is an opportunity cost associated with reduced casts equating to reduced procs, but for simplicity's sake let's ignore that), then cast DS to get off cap before casting any more HS. In general, your rule of thumb should be "keep RP between 40 and 105" (165 with pants), as this will prevent you from overcapping RP and from overdumping RP. As always, this won't be a perfect representation (because it's sometimes worth it to cap RP to ensure you'll have 120 RP for a high damage phase), but until you get comfortable at not wasting any resources, that rule should be fine.