Since the new balance changes made Death Sentence a horrible skill because of the high investment-low return of skillpoints and equipment, the skill should be completely overhauled.
Here are two possible PVE changes for Death Sentence to make the skill worthy of a Rank 7/8 skill:
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Change the CD time of Death Sentence to 20 seconds and give the skill 3 to 5 overheats (similar to the 10 seconds 5 overheat skills). As this skill is not affected at all by your weapon and as most skills/skill combinations will simply kill any monster within 16-20 seconds anyway with decent enough equipment[i.e. with a level 315 rare weapon or better], there is no reason why Death Sentence should be the only skill with a high CD time, no AoE capabilities and a maximum damage limit way beneath the damage cap.
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Change the CD time of Death Sentence to 20 seconds, leave it at 1 overheat but make it scale with your AoE attackratio as a true AoE debuff skill, adding + 1 addtional AoE attack ratio per skilllevel. In addition, give it an attribute for Oracle C3 that increases the AoE radius of the skill, so it becomes easier to hit monsters further away with the debuff.
