How do I get the Damaged Manikin?

I believe by fighting the captains and Eleane

this is listed in the guide to lg items, they drop from all elites and bosses (although Everlost isn't strictly wrong since they did used to be a captain/Eleane specific drop)

aha! xD I'm outdated, thanks for the correction Scath

I Couldnt Find This Boss Anywhere Here, And It Should Be With The Rest Of The Boss Infos
I Found A Boss From Battling A Lost Disciple of Du'Vhal
Upon Defeating One, Theres A Message About Is Appearing In The Bottom Left Area

The Boss Is Called Dia,Du'Vhals Hand

I Didnt Complete The Battle, Because She Starts To Summon Other Disciples, That Are Both Doing The 9 Turn Spell That You Need To Do A Lot Of Damage To Stop Or Lose Pretty Much
It Shows The Symbol For Me After Around 9 Turns, And It Brings These Into The Battle <-The Summoned Look Different From The Lost Disciples of Du'Vhal

<-Energy Prism Symbol
And Did An Effect Called Energy Prison, Which Works The Same Way Stunned Does, They Cant Do Anything Until Its Over, And Idk How To Stop It

This Is What It Looks Like
And That's About How Far I Got, Because I Lost Soon After Because The Powerful Spell They Do Kncked Them All Out
But I Found My Pets Both Lost A Lot Of Health Quickly, And The Summoned Have Less Health And Looked To Have The Health Bar Deplete Faster

When Dia is about to summon Disciples you should block on your cannon or third party pet. This should avoid energy prism.

Took the suggestion of killing Demora first before her golems. Using t5, t2 and t4, she was taken down before able to empower her golems, and then the golems stay at max mana while doing nothing but regular attacks. Easiest tactic by far!

Is building the tracker hut mandatory stage progression? Or can you progress to caves without it? Gathering the sticky sap and earthen powder currently and it's gotten slower than before...all other buildings are built.

the only stage you need to do barracks building construction for is stage 2. Given what you're gathering, you are well past that

(although having the thing built can be nice since it gets you access to the weekly "An epic hunt" task once you have caves access, but very much not a necessity.)

I've reached the align with part, gathered 100% of each item but even after talking to the leader,princess,researcher and the guards , I can't get past the align task. I exited the Grove and reentered which worked before in similar situations but not this time. What's going on?