Build:Immovable Wall

Full Build Details
This build is a different take on the classic max damage resistances build, emphasizing impact resistance. This is to facilitate a playstyle where you largely ignore your enemies attacks and just whale away at the enemy with your weapon. This means you likely won't use many skills as many of the most useful melee skills are counters that are less valuable with this build's damage resistance, however you can certainly use any skills you desire. Puncture is on the quickslot bar for almost entirely for dps. Some care should be paid to the durability of your gear, as you will be taking a lot of hits, and while even boss fights should be over before this damage affects your stats and therefore your damage resistance, continuous combat may do so. This can also be mitigated by simply not facetanking all hits, via blocks or even dodges. This version of the build is targeted at endgame bosses, and as such you can make modifications or exclusions depending on your specific circumstances. For example, some buffs can be excluded if not facing an enemy that does that type of damage. The Lantern of Souls is required to attain full damage resistance, but if you are willing to go down to 80% ethereal, 95% lightning, and 95% fire resistance, can be removed to use a 2h weapon. On a side note, this gear is not very good for movement speed, so for traversal it can be beneficial to bring a Jeweled Pearlbird Mask and Master Trader Boots. Master Trader Armor would actually be a negative in many situations as equipping it would mean carrying the very heavy White Kintsugi Armor.

The quickslot setup is very open, with Talus Cleaver being the only must have. As a result, the rest is up to preference, what I have written here is only a suggestion. Other melee skills as well as adapting the hex skill to the elemental damage type you are currently using can be useful.

This build makes significant use of debuffing weapons, namely the Mace of Seasons, Maelstrom Blade, and Brand. While not vital, it only takes two hits to apply the debuff and can provide significant benefits against powerful enemies. However against lesser enemies, it will likely not be worthwhile to use debuffing weapons, although all of the weapons chosen are powerful enough to be used on their own.

Mana is required but due to the Well of Mana passive, I'd recommend only taking 20 points of mana from the Ley Line. This build also requires joining The Holy Mission of Elatt, primarily for the Purified passive. Whether you choose Spiritual Communion or Divine Assistance is not relevant to the core of this build and is thus up to you.

As for enchantments, no enchantments are vital to the core of this build. As such, which ones you pick are up to preference. Aegis can be applied to any armor piece, but offers marginal benefits at best. For some corruption resistance, Elatt's Sanctity on the helm and Filter on the armor and boots offers 25% corruption resistance. Flux instead on the boots offers 3% movement speed and 5% lightning damage. For weapons, you are choosing between Poltergeist and Whiplash. Based on some calculations from the discord, Poltergeist is only better fully buffed when an enemy has above ~70% physical damage resistance, so which enchantment is best on weapons is again situational. Also, since many of your weapons are for debuffing, enchantments offer little benefit on those weapons.

This build is entirely usable without the Soroboreans DLC, with slight adjustments. You won't have enchantments or hex skills, and will want to replace Bagatelle with Marshmelon Tartine and a source of Possessed, but no major element will be lost.

Progression
Three legacy chests are required for this build, for the Lantern of Souls, White Kintsugi Armor, and Crimson Plate Boots. All three can be obtained in a single Blue Chamber playthrough. My recommendation for the fourth would be a Jeweled Pearlbird Mask.

The base part of the build requires completion of the Holy Mission questline for the Candle Plate Helm, while the Mace of Seasons and Maelstrom Blade require endgame materials but are non-essential debuffing weapons. Prior to having these, you can use a Blue Sand Helm or Gold Lich Mask instead of the Candle Plate Helm, while the debuffing weapons can be replaced with the Blacksmith's Vintage Hammer and Marble Morningstar respectively. An important note is that you do not always need full invulnerability, and prior to the endgame bosses, you can often forgo the Lantern of Souls and use your 2h weapon of choice along with any accompanying skills.

Combos
You should use Luxe Lichette after Bagatelle or as higher level buffs do not override lower level ones, only refresh the duration. Runic Protection has the lowest duration, and therefore comes last. You should also use an elemental varnish appropriate to the resistances of the enemy you are planning to fight. Rags can offer a less powerful but much cheaper infusion for use against weaker enemies. It should also be noted that only Cierzo Ceviche for Elemental Resistance and the various boons are required for damage resistances, and thus you can pick and choose buffs depending on the enemy you are facing as well as to save on supplies. Note that Bagatelle is supplying the Possessed boon here, and if excluding it you may need to source Possessed from the skill or a potion. Energizing Potion can be used as well, but since this build uses very few skills offers marginal benefits.

Mace of Seasons applies Elemental Vulnerability, Maelstrom Blade Confusion, and Talus Cleaver for Pain and Cripple. Brand is optional, as it applies Pain and Chill, but we already have Pain, so it's really just Chill. Puncture also applies Pain, but since that is redundant it's mostly there for dps if you so choose. This order ends with Sunfall Axe equipped, as it is the default primary dps weapon that is good against most enemies, but depending on the enemy's resistances you may want to use a different weapon as your primary dps weapon. Scorch Hex is also optional, and can be replaced with whichever elemental hex is most relevant to your primary dps weapon. All weapons here have 60% buildup, so it should take two hits to apply their status effect.