Reaper - Celestial Reaper Roamer - MetaBattle

General

Build Life Force by killing critters or any PvE mob before fighting players. Spamming "灵魂夺取！" while out of combat also works.
Both weapon sets offer a decent mix of defense and offense.
The Pistol/Torch sigils 超级洁净法印 and 超级能量法印 are defensive. Between this and 腐烂印记 you'll have some cleansing access on both sets.
Staff, while being your more defensive/utility focused set, also has 超级地能法印 and 超级厄运法印. The AoE ring from the Doom proc will always apply the 中毒 from Doom too if you're in melee range of an enemy, turning weapon swapping into an instant source of burst damage.
- The Pistol set has 2 CC skills, namely 恶毒爆冲 and 重压崩溃. Weapon swapping to Staff in melee range after landing a CC is a good way of instantly putting pressure on your target.
Weapon swapping isn't the only way to proc your on-swap sigils - entering and leaving 夺魂之幕 can also do it. This is important because ideally you'd get 2 procs per swap out of your sigils. You can see the weapon swap CD to the left of your skill bar even while in shroud, the 10s swap CD almost perfectly lines up with the 9 sec sigil proc CD. If you're in shroud, simply try not to exit until weapon swap is ready - this is your signal that enough time has passed for your sigils to proc again and you're free to exit shroud.
"严寒刺骨！" has a very distinct animation which makes it easy to avoid, if you feel like that's going to happen then stow your weapon to cancel the channeling. This is also great for fake casting - you can use the skill, cancel it immediately with weapon stow (the whole animation will still play, potentially baiting out dodges or other defensive CDs), and send it only on a CD of 5 seconds.
- Using "无尽苦痛！" right before CttB goes off could get rid of 目盲 on you or 圣盾 on nearby enemies without having to cancel the skill. Sometimes it's worth using this shout at the last moment even if you're not blinded, just to make sure that the elite connects even if you happen to eat a random blind in the last split second.
- could be used the same way as Suffer, being an instant skill. However this is less ideal, because while Suffer can transfer the blind and you get to reap all the benefits of landing that skill, YAAW actually misses. You basically sacrifice this skill to land your elite.
- Casting before the elite could further increase your chances of landing it, because it'll make the elite unblockable.
On Staff try to use after whenever possible in order to combo AoE . These are also your two most dangerous skills on this set.
Staff is more of a utility weapon, low damage but it has a condition transfer, a CC, snare, and adds much needed range to the build. The and are useful both for keeping distance when you're waiting for CDs and preventing enemies from escaping when they're trying to flee.
If you're using only for the mobility you should consider dropping out of shroud near the end of the animation. The very end of Death's Charge brings your character to a halt, we can cancel this by cancelling shroud.
Entering shroud acts as an instant defensive measure:
- Transfers conditions to enemies on your next attack via .
- Procs Lesser Enfeeble for from which strikes foes after a small delay. If Lesser Enfeeble connects it'll immediately transfer conditions with Plague Sending. This is a really powerful interaction that could save your life even if you're stunned, as shroud can be activated while sitting in a CC.
- removes one condition when you enter shroud and keeps cleansing you every few seconds while in shroud.

Shroud

Most of your burst comes from , where your damage is further increased by (if taken).
Opening with is very common, as it helps getting your damage off uninterrupted while the damage reduction helps you stay in shroud longer.
- is the chain skill of this slot. This should only be used when either A) you need an emergency CC, or B) Infusing Terror is about to expire.
should be used in the field created by for the whenever possible.
should primarily be used on CC'd or downed targets (as reduces the resurrection healing coming from their allies), but thanks to the permanent while in shroud this skill is now much easier to land without any real setup.
's a single target skill for the most part, as it only stuns one target. can targets long enough to prevent enemies from dodging this skill.
Use autoattacks when eveything else is on CD, or drop out of shroud.