【2.2】 Shattered Chains Glacial Hammer Build

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Main skill : 50% of physical damage is converted to cold damage and the elemental portion of damage scaling only works on the cold damage. Main source of the cold damage in this build is converted from the weapon physical damage of 2 handed mace therefore, physical damage modifiers are basically prior in the base damage scaling till the physical damage scaling gets less effective as it's stacked. All kind of scaling is used and balanced between physical, cold and attack speed in the skill links.

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Physical damage scaling

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Attack Speed scaling : Faster Attack gem can be used before the level required for Multistrike gem or when total attack time with Multistrike is too long to avoid deadly damages.
In this build, I picked only Multistrike(and gears with attack speed mods) to use Cold Penetration gem to damage and freeze enemies with high cold/elemental resist instead of Faster Attack gem in the skill link.

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Cold damage scaling : Those gems are essential for the build both in offensive and defensive wise. You can check the difference by swapping Cold Penetration for Faster Attack gem. Faster Attack can be a choice for a few situations in the maps with Temporal Chain and/or Chilled Ground mod. I still recommend Cold Penetration with using Vaal Haste gem.
I felt a small but noticeable difference in the freezing rates on white/blue mobs between 60% to 100% increased cold resist in Tier 13+ maps. I assume that this is one of the last walls to break. Unfortunately I couldn't achieve better mace or more levels in time.

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Area damage scaling : Splash damage area scales as the level of gem and also with other mods in passives and items. I recommend to start leveling as soon as possible and use once you achieved a 4 link in addition to Melee Physical, Multistrike. Till then, you can use Ice Crash for area damage.
I could keep using only Glacial Hammer as the main damage source with this gem in most cases including on the boss fights except for Rigwald, Atziri herself and Avatar of Thunder. This simplified my skill choices greatly thus resulted in smooth gameplays and higher DPS.

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Temporal ability boost

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Movement and utility : Leap Slam should be used with Blood Magic gem since all of Mana leftover is used for attacking to adapt in any situations including reduced/no regen map mods as well as to cover the cost of summoning golem. Blood Magic is used in the main skill links only when all of mana is reserved. I recommend to level more than one Blood Magic gem as well as Increased Duration gem to arrange skill links in the build progressions.

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Defence : This build is heavily centered around Glacial Hammer. Those defensive mechanics listed below don't save you always. You should be saving Flask charges and Enduring Cry for the expected near-death situations after hard engaging.
To counter Elemental Reflect mod, simply swap Weapon Elemental Damage gem for Life Gain on Hit and leap on every packs to proc Fortify as well as with Sapphire Flask. There was no choice as long as I tried with Purity of Ice, Life Leech gem and Sibyl's Lament Coral Ring. You can also use Heavy Strike with Weight of the Empire threshold gems (swap Cold Penetration gem for Faster Attacks, Weapon Elemental Damage for Fortify though it's not safe if you didn't drop Hatred.) You better not run -max resist mod with reflect.

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Supports : Arctic Armour is the only defensive buff other than the mediocre amount of armour even after picking Iron Reflex, damage conversions and Fortify or Vaal Grace when ready in this build. You will be lacking flask charges often in the hardest situations in Tier 13+ maps thus it's prioritized after Hatred over Heralds to get used to the required playstyle for this build.
Enlighten is necessary to have more mana leftover. I dropped Herald of Ice for Herald of Ash when I got Lv.4 Enlighten, to swap with Purity of Fire on mana with using Blood Magic gem in the main skill links when necessary.

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Gearing and build progression - Mace crit nodes and Dual Wield Crit nodes are mondatory and those are placed almost at both ends of the skill tree. Also you will have to collect every possible attack speed mods. Chances are slim to have the mod on all gears as well as resists, crit mods and all.

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Skill Links - Pure single target skill must have splash damage to kill a specific mob among the crowds of mobs. There is no support gem to drop in the 6 link. Going Slayer is the most viable way but still you will have to find critical nodes without Critical Strike Chance gem. Could drop Melee Physical Damage for Physical to Lightning Damage gem to go full elemental damage scaling with Call of the Brotherhood unique ring but it's already losing the sense and the stability. I'd rather go non-crit with dual weilding Doryani's Catalyst.