The Mountain Sire's Spine is a Mortal Unique zweihander, hunted from The Mountain Sire once you are at Threat 20 or higher. It is one of four Exceptional drops on its list — 2.5% of the Uniques that boss gives up, about 1 in 40 — and every kill rolls the list twice. It is built on Sovereign Atlas Zweihander — step 6 of the Atlas Zweihander line, item level 80 and up.
It always rolls the same numbers: +72 Power, −14% Attack Speed, +22% Power, +18% Stone Damage, +126% Power, +146% Stone Damage, +182% Critical Damage and +50% Attack Speed.
On top of that it carries The Mountain Sire's Spine — Your Main is attuned to Stone, swings wider and heaps Crumble on every foe; Sunder cracks the ground in a Seismic shockwave, but it winds up 25% slower.
It leans into Stone and Crumble.
It is Mortal Arena loot.
Wearing it hands you Charged Overhead and Whirlwind.
“Ask the mountain a question. Duck.”
Item text
The numbers it locks in
| Affix | Tier | Value | Normal range |
|---|---|---|---|
| Power prefix | T10 | +126% | 53–70 |
| Stone Damage prefix | T10 | +146% | 62–84 |
| Critical Damage suffix | T10 | +182% | 77–105 |
| Attack Speed prefix | T10 | +50% | 25–32 |
The part the stats don't show
Plays with
Everything that boss drops
| Unique | Built on | Kind | Weight | Share of its drops | |
|---|---|---|---|---|---|
 | The Quarry Warden's Brow | Sovereign Stonegaze Helm Head | LESSER | 90 | |
 | Cornerstone | Immaculate Gravestone Band Ring | LESSER | 90 | |
 | The Switchbacks | Exalted Longroad Boots Boots | LESSER | 90 | |
 | Rubble Rampart | Sovereign Gravewall Shield Off Hand | LESSER | 90 | |
 | Bedrock Testament | Sovereign Anchor Tower Shield Off Hand | EXCEPTIONAL | 10 | |
 | The Mountain Sire's Spine | Sovereign Atlas Zweihander Main Hand | EXCEPTIONAL | 10 | |
 | Sediment | Sovereign Stonegaze Helm Head | EXCEPTIONAL | 10 | |
 | The Landslide Clause | Immaculate Ironvow Band Ring | EXCEPTIONAL | 10 |
