The Irresistible Force is the Immovable Object
Mountain Protector - Lv.120
9m+ edps, 110k+ hp, 33% resist all, 20k+ hp regen, 650+ movespeed, 4m+ aoe pure damage nukes every 0.3 seconds
Core Concept: I wanted to make a Mountain Protector build that utilized her Sierra Blade and leaned on E as a damage source, in order to take advantage of the tankiness of her W. I felt that this would produce the most damage and survivability with the least work (no Q spam, no movespeed stacking, no W toggling, etc). Left Click already had a pretty solid build (found at https://www.roshpit.ca/heroes/builds/view/1671) that took advantage of E as a damage source, so I used that as a blue print and put my ideas into it to reach a build that I'm happy with and proud of. Imagine if you put Wolverine's Healing Factor into Juggernaut's body and let them teleport like Nightcrawler, and every time they teleported they exploded as if Gambit had charged a nuclear warhead. Now THAT's how you protect some mountains.
Gear: This build is definitely flexible. The weapon and chest are pretty much set, you'll have some options elsewhere, with a bonus pretzel meme build variation at the end.
Weapon- This is a must for any build that relies on E for damage. Try for any combination of Str/W1/E1/R1.
Chest- For an E build, her Rcana is also a must in my opinion, due to the awesome scaling of R1, and the "never die unless you're bad or AFK" nature of R2 (it's a free life every THIRTEEN seconds). Try for any combination of Str/R1/R4.
Gloves- To get the most out of your E1, Master Gloves are actually your BiS. E1 is multiplicative with BAD% for R, which allows us to stack some truly ludicrous damage. R1/R1/BAD% are your rolls here.
Boots- Dunetreads, when coupled with Sierra Blade, give you a 0.3 second cooldown on your E, and their Ruby gives you a 28% chance to not have a cooldown at all. They also give you a much needed boost to movespeed as Mountain Protector moves about as fast as you would expect someone named "Mountain Protector" to move. They can have 435 Str, or 150% BAD, roll your preferred combination. As always, I believe that a dead hero means zero dps, so I opted for pure Str. As a bonus pretzel, our R scales with Str anyway, so while you're adding a lot of tankiness with pure Str rolls, you're not sacrificing THAT much damage by neglecting BAD% rolls. Shifting ALL of the Str rolls on my gear over to perfect BAD% rolls results in a loss of about 15k hp, and a gain of ~2m edps. So you do you, booboo.
Trinket- The scaling of E1 almost demands that we use a RoN here, but the REAL hidden gem is that once we augment it, the ARoN gives us 240 Int, which is enough for us to keep W toggled on 100% of the time. Without this you will either have to A - not level W up all the way, to sustain a lower mana cost (blech option), B - worry about toggling your W on and off in order to manage your mana, which could come at an inopportune time and cost you a death (blech option), or C - use one or more of the rolls on your gear to roll Int or Mana regen (blech option). Obviously, using an ARoN here is the superior choice. Roll E1/E1/E1.
Helm- Helm of the Mountain Giant let's us stack Str, gives us 33% resist all, and boosts our hp to a nutty degree. The reason I opt for this helm over the dps options, is because our W1 is PERCENTAGE BASED, meaning that W1 scales not only with Rune Points, but also with our hp. The higher the hp, the higher the regen, which is how we achieve 20k+ hp regen per second, which are insane levels that are typically only attainable by Voltex Ecana builds.
Glyphs: Glyph of Catastrophe is a must, as without it this build goes from "Great build" to "non-viable because Golden Skullbones are the work of the goddamn Devil". Glyph of Mountain's Peak is also a must unless you like standing still and waiting for cooldowns a lot (hey, some people are into that, I'm not here to judge you). Your third Glyph is flexible, but I much prefer Glyph of Aeon Schism as it allows our R to have overlap, resulting in 100% uptime. Without it, our survivability and dps both suffer, but there are other options here (Glyph of Fleeting, for instance).
Gems: A wonderful aspect to this build is that basically all of its gems are completely optional and basically just QoL upgrades. All of the effects and stats we need come directly from the gear itself, making it a superb choice as an end-game build for players that are "Mithril Rich and Gem Poor". When you do start to gem it, obviously Pristines into your RoN need to be your first priority, after that your helm is going to offer you the most value for survivability, while gloves will offer the most dps.
Runes: The core of this build is W1, W2, E1, E2, E4, R1, R2, R4. Unfortunately Q2, Q3, Q4, and E3 are worthless for this build as we will only ever throw a Q for movespeed, and we have no need to break BKB as our E penetrates it. Since almost the entirety of our damage is pure, W2 and R3 are worthless as well as we have no need whatsoever for pierces. This leaves Q1 and W4 as our options. I like Q1 for the burst of movespeed on big maps, but you can also opt for W4 for extra tankiness.
Gameplay Pro Tip: You do not need to wait for your Emberstones to land before you cast another. You can have multiple traveling at once if you can aim and click fast enough. This allows you to lay bursts of ~15m pure damage onto enemies from range without the need to stand in the middle of them.
MEME ALERT!!!: So, you want a build for "no death" challenges, eh? No problem. Swap your Master Gloves out for Silverspring Gloves (Hp regen/Str/Str), your Dunetreads out for Iron Treads of Destruction (R1/Str/Str), and put 3 rolls of W1 on your RoN. The end result will be a hilarious build that has 33% resist all, ~100k hp, ~113k hp regen (yeah, you read that correctly), ~92k pierces, and 1m+ edps. More dps can be traded for regen by rolling E1 instead of W1 on your RoN.
Glass Cannon Variation: Swap all Str rolls for BAD%, and swap Helm of the Mountain Giant for Ocean Helm of Val'dun (Ele%/R4/BAD%/BAD%). You'll be significantly squishier with very low armors, no resists, and ~40k hp, but you'll push ~30m edps.
Pros: You do great damage, and basically can't die unless you're careless (like getting Ghost Maced and then standing there for BOTH of your lives). Ultra cheap on gems, and uses 2 ultra cheap pieces of underused gear. W1, E1, and R1 are the three bases of our dps and survivability, so this build is viable even at level 1.
Cons: Requires her Rcana and Immortal Glyph, and isn't exactly the fastest moving thing around for speed clears.
Note: edps is "effective damage per second". I test ALL of my builds on dummies that have 7k armor and 7k magic armor, so that you're seeing real world combat numbers on boss level armors, and not just some inflated "100m+ dps!" build that actually only hits for 2m dps on anything not naked and asleep.