The Very Earth Beneath Our Feet

In Order to get this quest, you have to finish all the previous world pillar quests. The ones you could easily skip by accident are:

Block the Gates - from Seer Galekk

the followup is:

Abyssion's Minions - from Stormcaller Mylra

and the last one in this chain is:

The World Pillar Fragment - from Stormcaller Mylra

So check out, if you have done all 3 quests, if you are not able to accept The Very Earth Beneath Our Feet

Bottom World Pillar Fragment Quest Tree From Whiterock

The Middle Fragment*              The World Pillar Fragment*
               \                      /
               a)The Very Earth Beneath Our Feet
               /      |               \
a)Crumbling Defenses a)On Even Ground a)Core of Our Troubles
               \      |               /
               a)Imposing Confrontation
               b)Rocky Relations
               /  |             \
b)Unsolid Ground b)Loose Stones b)Hatred Runs Deep
               \  |         ┌────┘
               c)Violent Gale
               c)Depth of the Depths
               c)A Rock Amongst Many──>#)Wayward Child(Stonecore)
               d)Entrenched────┐
               /               ├>d)Intervention
d)Putting the Pieces Together  └>d)Making Things Crystal Clear
S)Pebble
d)Clingy
d)So Big, So Round...
 |            \
d)Rock Bottom d)Petrified Delicacies
 ├─────────────┴───────────────┐                  ┌>f)Gone Soft
e)Steady Hand                 f)Rocky Upheaval────┴>f)Doomshrooms
e)Don't. Stop. Moving.        f)Familiar Intruders
 |           \                f)A Head Full of Wind
e)Hard Falls e)Fragile Values f)Unnatural Causes──>g)Wrath of the Fungalmancer
 |           /                /           \                        |
e)Resonating Blow    g)Shaken and Stirred g)Corruption Destruction |
                \     |                   /                        |
                h)At the Stonemother's Call                        |
                h)Audience with the Stonemother                    |
                i)Rallying the Earthen Ring                        |
                j)Our Part of the Bargain                          |
                /  |                  \                            |
j)The Stone March j)Therazane's Mercy j)The Twilight Flight        |
                \  |          ┌────────┘                           |
                k)Word In Stone                                    |     ┌>Fungalophobia
                k)Undying Twilight                  ┌>D)Glop, Son of Glop┴>The Glop Family Line
                k)The Binding                       |
                k)The Stone Throne─Revered,OnePerDay┴>D)The Restless Brood──>My Very Own Broodmother
┌────────────────┘ |
├>D)Motes          |         ┌>D)Beneath the Surface
├>D)Soft Rock      └OnePerDay┼>D)Underground Economy
├>D)Fear of Boring           └>D)Lost In The Deeps──>Rock Lover
├>D)Through Persistence
└>D)Fungal Fury──>Fungal Frenzy

Legend:
S menas Skippable
# means Other Zones
* means another Quest Tree.

IMPORTANT INFO:

1. 
   
2. The World Pillar didn't made it to live.
3. 
   
4. Wrath of the Fungalmancer is indeed needed for Glop, Son of Glop to be aviable.
5. 
   
6. Underground Economy is used to get to [npc=49822] read comments on NPC for more info.
7. 
   

Dude's behind the temple on the ground at 46, 45.