Noticed that Defender's only good exotic is No Backup Plans, so mine is along the lines of that. Thought about wanting to make it so you could shoot players while having a shield so I looked at Vex Hydra shields and had a idea.
Vexed Mind: Defender Helmet
Pure Intellect
Intellect/Strength
Ashes to Assets/Angel of Mercy
Invigotation
Exotic: Decreases super duration. Makes Ward of Dawn into a orbiting half shield that protects nearby players.
This would allow Armor of Light to affect all nearby players while allowing everyon e to shoot outside the bubble, but would be difficult to implement ironically with the half shield in the way of fire. It would make interesting gameplay and that's important. You could also run around with weapons of light and a sniper, so that might be interesting.
I think there should also be a super that let's you shoot through the shield, but I'll leave it to you for that.
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No Backup Plans are the only good one? How about Saint-14, the best Titan Exotic in the game. Takeonaught Armamentarium Twighlight Garison Alpha Lupi These are much better than the Backup Plans.