Scytheguard's core passive that allows us to buff and heal. You either learn this, or you go play a different class.
Level 45 is when our support buff/heal turns into a global cast.

Improves buffs and healing by 20% when consuming 6 marks instead of 3. Also a no brainer.

Scytheguard's main DPS skill. Fire and forget skill that shreds enemies for up to 40 hits, and the three-way scatter makes it much better for mobbing when needed. You can jump-cancel on start-up to skip the post-cast delay.
Only one scythe will hit a large target if all three of them are overlapping.

Dual purpose summoning skill that can either heal nearby allies over time, or rapidly damages nearby enemies. Hold the skill to pick which version you want to cast.
You can jump-cancel out of the skill on start-up and it will still summon the guardian without penalty.

An almost instant AoE skill that either link up to two other enemies and cause them to transfer an additional 15% DMG taken to each other (Soul Link), or link up with all your allies to share healing effects at a 15% ratio (Soul Crossing).
The damage is bad, but the utility alone makes this skill an auto-include as it'll save allies from dying, or shred enemies faster! You can also jump-cancel out of this skill with no penalty.

Filler 10-hit skill (with the upgrade) that has a reasonably fast animation, deals respectable damage, and the cooldown is short enough to let you gain New Moon marks between cooldowns.

Conal AoE with a fast animation that hits like a truck. You can safely jump-cancel on start-up as the guardian will finish the cast for you.

An almost instant AoE (Seeing the pattern here?) that heals (with the upgrade) and also deals respectable damage. This skill is also safe to jump-cancel.

The first finisher you learn; a solid burst skill with a respectfully fast cooldown, and generates both marks on top of that! An auto-include in most builds.

The last finisher you learn; creates a rain of explosions around you that leaves behind crystals, filling markers of the respective color. These crystals last for a full minute before expiring.
You also cast a DMG buff for 15 seconds, based on your ATK and DEF Shred ATK. Strong nuke that helps with buff upkeeping, but the long cooldown restricts it to burst scenarios (read: use this with Resonance active.)

Converts you from support into pure damage dealer mode. The 120% increase to your buff is no joke but obviously it restricts it to yourself. You should only learn this skill when soloing, or when there are multiple Scytheguards and you're the highest DPS.

Filler skill; slow animation holds it back from being good, and you'd only have this for the purpose of generating New Moon marks.

Filler skill; the main skill for generating marks as the animation and cooldown is fast. The upgrade debuffs enemies, which lets you activate conditionals like DMG to debuffed enemies.

Filler skill, and our only main mobility skill. This is mostly for PvP.

Filler skill; long animation and lackluster damage makes it bad to use in most cases, but it's great at gathering mobs.

PvP skill. The sluggish animation requires you to commit for full damage, but the fact that this skill is 2-hits makes this viable for burst scenarios, which Scytheguard excels at.

Actually a good filler skill against large bosses if you land all the hits, but against small enemies you'll just end up pushing them away from your teammates (or whiffing entirely!), and the long animation holds it back as a main DPS skill. Jump-cancel at the end to remove the end-lag.

The second finisher that you'll learn at Level 45; deals massive burst damage like your first finisher, but the slow animation makes it possible for bosses to move out before it finishes, and the cooldown is really long for what it is. This skill gets better when you have gear that reduces the cooldown on it.

The defensive skill that gives you and everyone a whopping 38%+ DMG reduction while in the field! Unfortunately, Crystal of Atlan is a game where the best form of support is killing the bosses so the fights don't snowball from taking too long, but this is undoubtably a great skill to save/protect allies from scratch damage.