Last Thursday, Ghostcrawler tweeted something which caused a bit of a stir within the tanking community. In it he revealed that the devs were looking at some strict caps for Vengeance levels (30% of health for 10s, 50% for 25s) that would prevent tanks from using Vengeance to pursue unintended things like solo tanking a two-tank raid boss or standing in fire to stack really obscene amounts of attack power.
Now, this isn't another column about the virtues or not of Vengeance. That's a pretty mutilated horse at this point, and from the looks of it, the mechanic is not going anywhere any time soon. However, the brief rekindling of the Vengeance debate did once again shine some light on what is a continuing problem in WoW: what should tanks be allowed to do (in terms of damage output) and what can be done to keep players from parlaying excessive survivability into unintended advantages?
What do you do when one third (arguably two-thirds, a lot of this can apply to healers as well) of your players' roles revolves around the mitigation and prevention of damage, and the primary means you have of creating barriers or challenges for players is the threat of character death?