Everything dies, except for you.

This is a very high investment build, requiring 4 regular formas and an umbra forma, so here's why everything is in here as well as how to play the build.

This build will, however, annihilate literally everything in the game both solo and with a party without ever having to swap mods. Keep reading if that's something you're interested in.

Strategy

Start combat by making sure Toxic Lash is rolling, then cast Spores on your first victim. Damage that target. Watch everything around you die. Genuinely, that's all there is to it.

If you decide to use Gloom, as recommended, here, keep that rolling too. [Primed Continuity] is only there to keep Gloom from being an energy hog. If you don't want to use Gloom, drop the Madurai (V) polarity in that slot and use Augur Secrets instead of Primed Continuity.

For weapons, Cedo is the god-king primary for [Saryn] now. I like this build quite a bit. [Lesion] is my uncontested melee choice and it's hard to build it badly. I run a [Kuva Nukor] in my secondary slot but it's massive overkill and wildly unnecessary.

The Build

[Saryn]'s #1 stat is range, which is the determining factor for spore spread. To that end, we have used literally every range mod we can get our hands on. [Overextended], [Stretch], and [Augur Reach] are mandatory. You can swap [Cunning Drift] for [Sure Footed] if you, like me, absolutely cannot stand getting knocked down, but unfortunately we would need TWO umbra forma to use Primed [Sure Footed]. We would also need 400 days of logins, so good luck with that.

The Umbral Triumvirate is what offsets [Overextended] to keep our power strength in the positive, but using all three brings [Saryn] to a monstrous, unconditional 5550 eHP. We honestly don't even need Arcane [Guardian] with armor that obscene, so feel free to put Arcane Grace in there instead.

[Primed Continuity] is there for Gloom. It's nice for Toxic Lash, too, making it so you only have to apply it once a minute or so. Luxurious.

[Transient Fortitude] isn't absolutely necessary but [Saryn] does like some power strength and it's a way better choice than [Blind Rage], which will obliterate your energy very quickly. If you don't think you need the power strength, forma that slot as D polarity and use [Adaptation] instead.

[Energy Siphon] isn't a mandatory aura. If you do swap it out, I recommend [Corrosive Projection]. Arcane Energize does a lot to keep our energy topped off, as does the Zenurik dash.

This build doesn't have any healing, so I use my pet and Magus Repair to stay healthy. Arcane Grace is another option, but I don't personally have that one. [Healing Return] on [Lesion] is an option but is overkill IMO. This build has truly ludicrous damage reduction and it doesn't even use [Adaptation].

NOTE: [Umbral Fiber] is one point short of max strength. If yours is maxed, use a [Cunning Drift] that's one point short of maxed. If you max all of your mods, this build requires two umbra forma.