So for Defender Titans: Magnetic grenades are easy kills. Works just like Flux and Fusion grenades. Spike grenades work similar to lightning grenades but can also be used like a pulse grenade. "Jack of all trades, master of none" Suppressor grenades are what you should use honestly. They can stop supers, grenades, and melee attacks. Takes skill and time to learn the mechanics but very good in capable hands. For Ward of Dawn, I like going with Blessings since you can get more mobile. Armor of light your stuck in the bubble and a well timed super will obliterate you. Weapons of light you really don't need in crucible, it helps greatly, but I'll take Blessings over Weapons. It especially helps later in the match where you see a GG hunter or a titan charging and you know it's time to retreat. For melee aspect, go with war machine or unbreakable. I go with unbreakable since it keeps my shield up. 7 out of 10 times unbreakable will fit the situation better than war machine. Gift of light is useless in crucible, gift of void is almost always going to be better for orb making. Bastion is good as well since your bubble of safety stays around longer. For the last perks, it really depends on your play style. With randoms, i find that Untouchable and Illuminated are best, especially untouchable. Having your bubble of safety ready to go quicker is going to be a lot better than the extra 2-3 seconds illuminated will give you for Blessings or Weapons. Iron harvest is really good with a fireteam. While best when used with a LMG, even with a rocket launcher, you will be making orbs for supers and combined with gift of void, you should be able to give your team their supers in no time. Unlike striker titans, you really have to spec your defender up right with your play style. You can become a shielded machine, with No Backup Plans, and everything spec'd to support that; meaning full strength, blessings of light, illuminated, etc. However, the most commonly used, and rightly so, exotic armor is the Helm of Saint-14. This is what makes defender titans a great asset. Anything in the bubble, outside of your fireteam, becomes blinded. Meaning that guy rushing into your bubble with a shotgun better be able to use his Crota helmet's third eye to find you. It's also very versatile to use since you don't have to actually be in the bubble for them to be blinded. Playing control on Asylum? Put a bubble in the corners and watch opponents round that corner and be like "Oh shit", panic, and either run away or run into your shotgun, Thorn, Red Death, whatever.