TL:DR[spoiler] Give "Ward of Dawn kills" points for both players, possibly increase the Defender to full assist points for any kills by teammates who are using the buff from that Defender's Ward of Dawn.[/spoiler]
Many posts have talked about "the chart" and point out that the incredibly low k/d of the Defender subclass really reduces the incentive to play as one in PvP.
Most solutions suggested are asking for ways of making the Defender more offensively potent. Many, including me, don't like that idea as it seems to kill variety. I like that it is a support class. If I want to play Offender, I have two other subclasses for that.
K/D (alone) doesn't win matches. Points win matches. Defenders can help their teams score points by holding down a Control zone or protecting a heavy ammo crate (once a match... woo!) without getting kills of their own.
But! Ward of Dawn buffs teammates, and I don't see that coming into team play very much. Why? Other players risk getting wrecked if they are near that giant Nova Bomb or Stormtrance target a.k.a. the bubble.
My suggestion:
Give teams a reason to use the bubble. If a teammate gets a kill while buffed by Ward of Dawn, how about giving the Defender a full assist [b]and[/b] incentivize the teammate to pick up the buff, give the killer 10 to 20 "Ward of Dawn kill" points and the Defender the same (or more, the full 25 point assist).
A support character isn't supposed to top the K/D board or the scoreboard every game, but a more tangible indicator that the class [i] helps the team win [/i] might be in order.
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Killing an enemy while buffed by an allied Defender's Blessing or Weapons of Light currently awards the Defender 15 points. You could be forgiven for not knowing that, however, because most Defenders run Armor in Crucible. As you noted, the Ward makes you a target and ties you to an area, and Armor provides your best chance of surviving what follows. The problem with your thinking is that in this game "defending" as a matter of practicality means "killing all the attackers." Structuring potential buffs around the idea that the Defender should be played more conservatively than other subclasses is fine, but if you aren't doing anything to increase his ability to actually defend himself your just going to leave him a sitting duck.