Reaper - Spectral Onslaught - MetaBattle

General

Spectral skills, Staff marks and Focus 4 are going to be the main Life Force (LF) builders.
- Even at maximum LF you can consider using 鬼灵铠甲 before entering 夺魂之幕. Both the 保护 and the extra LF from incoming attacks are going to increase the time you'll be able to spend in shroud.
- Spam 灵魂抓攫 as much as you can if you're not at the Life Force cap.
There's more to 鬼灵影步 (SW) than just being a stun breaker with a bit of LF management, this skill allows for quite a bit of creativity. For example:
- Activate SW ⇒ jump off a cliff while being chased ⇒ 鬼灵逆行 when your enemies jump after you.
- Activate SW ⇒ break line of sight ⇒ cast "严寒刺骨！" ⇒ teleport back at the very end of the channeling (this makes it harder to avoid and reduces the chance of getting interrupted, although the outcome is going to be a bit luck based).
- Activate SW ⇒ 暗蚀传越 (if using Flesh Wurm) ⇒ teleport back when they catch up to you. This works for stomping downed enemies as well, the channeling isn't interrupted by either of these teleports!
For mobility use the following sequence:

夺魂之幕 (also applies 迅捷 from 暗影疾速 when playing with Greatsword)
死亡冲刺
解除夺魂之幕 just before Death's Charge finishes (the ending of DC brings your character to a halt, which can be cancelled by dropping out of shroud early)

"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.
恐怖之爪 is one of the best burst skills in the build. Try to use it when you have a fair amount of stacks, , and preferably on the target.
Keep using even out of combat to build Life Force.

Damage

Axe/Focus is the burst set, Staff is more of a defensive/utility one.
is one of your strongest burst skills but only against targets with 3 or more boons. Try to use this when is active for a guaranteed crit.
always does good damage but scales up against targets with .
works best against low HP targets but it's also the only AoE skill on this set, so if you really need cleave damage then the HP doesn't matter, just use it.
Staff has low damage except for , but usually that skill should be kept for defensive purposes as it's one of your few condition management tools (unless you really want to greed and get a kill).
is great at snaring targets and applying healing reduction via

Shroud

Most of your burst comes from , where your damage is further increased by and .
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 auto attacks when eveything else is on CD.
Burst combo example: (gap closer with good impact damage) ⇒ ⇒ ⇒

Greatsword variant

is the only thing that justifies taking Greatsword, its strength is arguably on par with Well skills. Nightfall is fairly versatile and useful in many sutations, especially when it comes to surviving vs melee players or 1v1ing on point (but that's not your main role).
The auto attack chain is just way too slow and will barely (if ever) be used.
suffers from the same problem as the auto chain, but at least it hits way harder. This will mostly be used as a downed cleave skill when Shroud is on CD, but if you're feeling lucky you can try to use it for bursting in regular combat especially against bunkers. Much easier to land with some lingering from .
is excellent for stacking some vulnerability/life force.
is a decent CC but can be hard to land against moving targets.
After unloading skills 3-5 spend most of your time in Reaper's Shroud waiting for weapon swap to come off CD.