Unbound Monstrosities

Unbound Monstrosities involves killing World Bosses, like the Unleashed Monstrosities achievement from Legion.
These bosses are only up one at a time, when his or her specific World Quest is active.

World Bosses:

Kul Tiras:

• 
  
• Hailstone Construct - Drustvar - Hailstone Construct - frosty golem
• 
  
• Azurethos - Tiragarde Sound - Azurethos, The Winged Typhoon - bird, will try to fling you out of Brokenbough Roost
• 
  
• Warbringer Yenajz - Stormsong Valley - Warbringer Yenajz - reality-distorting void aberration
• 
  

Zandalar:

• 
  
• T'zane - Nazmir - T'zane - Drust? Monstrosity who seems to contain many absorbed spirits
• 
  
• [npc=132253] - Zuldazar - Ji'arak - dino bird, uses her wings to attack with air a la [npc=69712]
• 
  
• Dunegorger Kraulok - Vol'dun - Undead Dino likely in Vol'dun
• 
  

[currency=1580] is likely to be the Bonus Roll currency, if there is one for World Bosses.

The World Boss rotate in order of the achievement; on a six week cycle. I will list them below and their most recent spawns (all dates are the "Week of"):

• 
  
• Ji'arak - January 29, March 12, April 23
• 
  
• Hailstone Construct - February 5, March 19, April 30
• 
  
• T'zane - February 12, March 26, May 7
• 
  
• Warbringer Yenajz - February 19, April 2, May 14
• 
  
• Dunegorger Kraulok - February 26, April 9, May 21
• 
  
• Azurethos - March 5, April 16, May 28
• 
  

*I verified past dates using Wayback Machine of Wowhead's home page and checking the BFA World Boss World Quest.
*Dates in italics are those to be estimated when the World Boss will be up next.

This post is under construction atm, feel free to add comments.

World bosses only availiable to locate and kill during their world quests are active.
There are 3 world bosses located on Zandalar and 3 on Kul Tiras.
There's also [npc=138122] may be found in Arathi Highlands, but it doesnt need for Unbound Monstrosities

Hailstone Construct Location video -
Azurethos Location video - https://www.youtube.com/watch?v=KMDjQiJ0ut0
Warbringer Yenajz Location video -
T'zane Location video - https://www.youtube.com/watch?v=BO5spvUrR1s
[npc=132253] Location video -
Dunegorger Kraulok Location video - https://www.youtube.com/watch?v=CR0LoJZo4QM
.

Unbound Monstrosities

Boss

Hailstone Construct

Azurethos

Warbringer Yenajz

T'zane

[npc=132253]

Dunegorger Kraulok

Zone

Drustvar

Tiragarde Sound

Stormsong Valley

Nazmir

Zuldazar

Vol'dun

Spot

50.2 74.7

61.7 23.3

82.6 48.8

36.0 33.5

69.4 33.2

44.0 55.8

Quest

A chilling Encounter

The Winged Typhoon

The faceless Herald

Smoke And Shadow

The Matriarch

Sandswept Bones

Plate drop list

[item=161372]

[item=161398]

[item=161358]

[item=161396]

[item=161409]

[item=161408]

[item=161370]

[item=161360]

[item=161397]

[item=161371]

[item=164386]

[item=164383]

Mail drop list

[item=161367]

[item=161369]

[item=161357]

[item=161393]

[item=161394]

[item=161406]

[item=161368]

[item=161356]

[item=161355]

[item=161395]

[item=161407]

[item=161405]

Leather drop list

[item=161364]

[item=161352]

[item=161353]

[item=161391]

[item=161403]

[item=161402]

[item=161366]

[item=161365]

[item=161354]

[item=161392]

[item=161390]

[item=161404]

Cloth drop list

[item=161362]

[item=161350]

[item=161351]

[item=161389]

[item=161401]

[item=164385]

[item=161361]

[item=161363]

[item=161349]

[item=161387]

[item=161388]

[item=161400]

[item=164384]

[item=161399]

Misc drop list

[item=161380]

[item=161377]

[item=161359]

[item=161412]

[item=161419]

[item=161381]

[item=161379]

[item=161376]

[item=161411]

[item=161378]

TomTom:
/way Drustvar 50.2 74.7 Hailstone Construct
/way Tiragarde Sound 61.7 23.3 Azurethos
/way Stormsong Valley 82.6 48.8 Warbringer Yenajz
/way Nazmir 36.0 33.5 T'zane
/way Zuldazar 69.4 33.2 Ji'arak
/way Vol'dun 44.0 55.8 Dunegorger Kraulok