A couple of things I was going to mention. My WhirlyBabe had a Taeguk up to rank 62, so I figured my DH could "borrow" it. Since Rapid Fire is a channeled skill, that was a no-brainer. Except I was the one with no brain; Taeguk damage only stacks when you "spend resource on a channeled skill" and since the channeling cost is removed, you don't get the Taeguk damage stacks. The other thing I was looking forward to was using Obsidian Ring of the Zodiac to get perma-Vengeance. Same problem; it doesn't appear to reduce cooldown because I'm not spending resource. Either that, or it's that damned issue with "per hit" and channeled skills and proc coefficients and other stuff I don't understand. I mean, I understand the theory; I'm just not obsessed enough to actually work out the math. It doesn't work like I thought it would.
But basically the Legacy of Nightmares, and now Legacy of Dreams gem, seem to fill in a niche I hadn't really considered. They crank up damage in general, so if you have a favorite skill you want to build and there's no set for it, you're not SOL. Just equip a Legendary item in each slot, Ancient if possible, and your damage is going to crank up. I'm sure there are some synergies I could work out, or again refer to the online build guides, but I already glanced at the Icy Veins guide and it said to use Grenades, and I just think grenades are boring. Rather than that awesome machine-gun effect, it kinda spews out these turd-looking things. They do crazy damage, but I just don't like the action. Give me High Velocity with its 50% piercing. She's not going to threaten the DH leader boards or anything, but she's having some fun, and that's all that matters to me.