Rain of Arrows starts to feel far better once you stop treating it like a one-off nuke and start building around the flow of the whole fight. In practice, the D4 items you choose can decide whether the skill is just flashy or actually carries your run. Most players notice the same thing after a few dungeon pushes: if your resource spending is tight and your cooldowns are under control, the ultimate shows up again and again, and that is where the build really comes alive.
Why the setup works
The biggest shift comes from the Preparation specialization. Every 75 Energy spent trims 5 seconds from your ultimate cooldown, so you are rewarded for staying active instead of waiting around. On top of that, firing an ultimate gives you 15% damage reduction for 10 seconds, which matters more than people think when packs start piling in. That little bit of breathing room lets you keep moving, keep shooting, and avoid those awkward moments where you are stuck hoping for a reset.
Core gear that changes the rhythm
The Legacy of the Sightless set charm is a huge part of the setup. The two-piece bonus cuts 6 seconds from active ultimate cooldowns when you enter Stealth, then gives you a 60% multiplicative damage boost for 6 seconds after you break it. The three-piece bonus is even cleaner in real play: cast an ultimate, and Concealment resets, gets all its upgrades for free, and adds another layer of damage reduction. That means Stealth is not just for safety. It is part of the damage loop.
Item or bonus Main effect Why it matters
Preparation Cooldown reduction from Energy spent Keeps Rain of Arrows available more often
Legacy of the Sightless Stealth-driven cooldown cuts and damage spikes Turns Concealment into a damage tool
Nilfur's Narrow Eye Marksman scaling with Vengeance Pushes both speed and burst higher
How Nilfur's Narrow Eye fits in
Nilfur's Narrow Eye is the other piece people keep coming back to. Its two-piece bonus builds Vengeance when you use a Marksman Basic Skill, which means more movement speed and more damage for Marksman attacks. The three-piece bonus adds Dark Shroud shadows and better damage reduction while Vengeance is up. Then the five-piece bonus does the heavy lifting, giving a 200% multiplicative damage increase to Marksman Skills and repeating your last Marksman Basic Skill three times when you hit a targeted enemy with a Marksman Skill. It sounds wild, and honestly, it is.
Items, weapons, and the last bit of polish
A Swift Legendary Horadric Seal of Glory helps with cooldown reduction and opens more charm slots, while Resourceful Runic Mail raises your maximum Energy so Preparation can keep doing its job. The Ocelot's Eye of Aftermath amulet feeds Energy back when you cast an ultimate and adds another layer of cooldown help. For weapons, Azurewrath is the standout choice. The crit damage is strong, and the freeze explosion effect adds extra crowd control plus more area damage. Put it all together, and you get a build that keeps cycling through Energy, cooldown cuts, and hard hits. If you want to buy cheap D4 items to fill the missing slots, this is the kind of setup that actually pays off in real endgame play.