My most played classes are stam sorc and magicka dk. The magicka dk has had horrible sustain for a while now, and with sets like desert rose nerfed in the past and the morrowind changes to cp, sustain is very difficult to pull off. Not to mention the nerf to battle roar, essentially the dk's only way to sustain through the class. With no dynamic ultimate, a weakened battle roar, and high cost abilities, it is near impossible to sustain efficiently in pvp especialyl while outnumbered. I have lost in so many 1vx situations just because my magicka pool was empty after going on the offensive for about 4-5 seconds. Note that I run light armor and have about 1200 regen. When I run heavy, the problem is even worse, even with cost reduction glyphs and sets such as lich or alteration mastery. While I do try to use my higher costing ultimate in order to get a bigger boost in resources, in a 1vx situation in openworld, being able to secure a kill before they can be healed or cast damage shields is very important, and that means using something like my leap early to secure the kill. What this does mean, though, is that that potential boost to resources is wasted early. Even if I were to save my high costing ultimate for when I get low on resources, the magicka returned is often not enough to sustain until my next ultimate is ready, which usually means I am stuck on my back bar heavy attacking while 3 guys are smashing my head in. Now, you can build for sustain on a magicka dk with sets that support that, but your damage will be minuscule and often lead to players you encounter to be unkillable. When abilities such as talons that are so important to synergize with abilities such as whip cost nearly 4k magicka, it is really hard on your resources. Magicka dks are forced to either run sustain sets and have next to no damage or pressure, or run a "balanced" setup with perhaps a damaging set and sustain set and still have to rely heavily on potions and heavy attacking in order to sustain their magicka. I think a cost reduction to abilities such as dragon blood and talons would be very beneficial, as well as dragon fire scale. These abilities can be unreliable at times and it is very hard to recover when they go wrong. For most magicka dks in pvp, talons is mostly used offensively in coordination with flame lash, and I think the cost of the ability should reflect that. Igneous shield and dragon blood are often used in unison to be effective, this means spending about 8k magicka in order to get a 5-8k heal, and while being pressured by multiple targets with the little mobility the class offers, can be a major problem for survival and sustain. I propose that one of the dragonknight abilities or passives provides magicka steal to targets so that the class can sustain. Templar has access to magicka steal and they have other sources of efficient and reliable sustain with abilities such as rune focus. Tie that in with the lack of absurdly expensive skills and you have a class that can successfully sustain in heavy armor as opposed to dragonknight. The patch notes for Summerset Isles that cover dk are mainly focused on more healing utility in the class. I believe this is a step in the wrong direction. All magicka dk needs is more reliable sustain so that those who play the class can more easily build for damage and survivability and be effective in outnumbered scenarios.