Sub-Boss,Unique, and Guild Boss Locations (Revised) - Credit to juliens6 on AeriaGames Forums

Blue = Announced/Unique Boss
Green = Guild Boss

Blue Bay
<Orchard Worm Boss> Bully Cowterpillar:
(469,309) (489,337)
<Blue Bay Pig Chief> The Baconator:
(688,398) (623,452)

Quote :

Shell Hill
<Hill Worm Boss> Caterpillager:
(202,107) (157,150) (309,189)
<Shell Crab Boss> Grinningham:
(406,282) (310,365)

Ironwheel Beach
<Pink Brigade Leader> Popeppi:
(190,280) (140,290)
<Ironwheel Boar Lord> Babe Ruthless:
(70,60) (104,155)

Kaslow Plains
<Grasslands Sunbird King> Otori
(338,402) (359,456)
<Armored Vegetarian> Chimerama
(651,376) (556,513) (594,388)
<Deer Chief> Cariboomer
(132,415) (209,450) (220,354)
<Exiled Shaman> Ojisk
(417,648) (458,623)

Moonlight Forest
<Forest Sunbird Boss> Loco Boco
(566,211) (410,165)
<King Under the Moonlight> Shika Stag
(462,429) (367,486)
<Goblin Hero> Big McLarge Huge
(723,146) (704,204)
<Cursed Flower> Horatio
(603,402) (661,359)

Steam Mine Mountain
<Quarry Sunbird King> Huntan Peck
(628,343) (591,419)
<Lizard Leader> Fancy Frilled Lizard
(194,387) (181,473)
<Mine Boss> Mutant Bloody Spider
(279,295) (165,272)
<Little Runaway> Ruby
(366,624) (368,573)

Sprites Forest
<Forest Flower King> Pernicious Pansy
(214,587) (167,598)
<Forest Elder> Evergreen Treant
(300,142) (208,198)
<Ancient City Butterfly King> Papillon Sprite
(331,415) (422,413) (470,369)
<Tempted Conjurer> Tilaye
(263,473)

Ancient Forest
<Medicinal Flower Boss> Brutal Blossom
(233,877) (107,870) (164,838)
<King of the Ancient Forest> Primal Tiger
(464,349) (326,275)
<Echo Tree King> Thundering Treant
(597,306) (625,351)
<Walking Target> Tiamu
(447,432) (330,490) (430,545)

Red Ridge
<Hilltop Scorpion King> Blue Bluff Scorpion
(539,225) (565,244)
<Involuntary Blood Donation> Blood Storm Wasquito
(269,268) (227,236) (307,280)
<Red Chief> Mutated Sabretoothed Tiger
(598,176) (546,164)
<Airborne Weirdo> Jester
(594,114) (615,144)

Belcar Plateau
<Belcar Chief> Marquis Kong
(515,42) (483,101)
<Cloned Beast Boss> Rampaging Cloned Beast
(688,531) (530,503) (580,555)
<Bonecrushing Lord> Mighty Bone-Eating Drake
(714,416) (716,501)
<Ravening Spectre> Enarker
(186,437) (113,428)
<Watcher of Slaves> Xerxes
(120,508) (142,605) (51,576) - Circles around Meteorite Crater

Black Swamp
<Crocodilian Swamp Lord> Blackblood Gharial
(563,548) (613,486)
<Haunted House Imp Lord> Fell Winged Imp
(391,302) (492,367) (509,295)
<Night Apparition> Saxilundor
(127,190) (223,210)

Southern Island
<Rollback Crustacean> Clawe-Inspiring Crab
(420,1080) (556,912)
<South Sea Bossman> Biggie Bigfist
(611,647) (531,638) (575,727)
<South Sea Ape Chief> Prince Kong
(674,441) (609,510)
<Hooligan Kid> Kahlua
(165,1037) (160,1067)

Plague Forest
<Deadwood Forest Boss> Pestillent Fangfly
(148,772) (504,501)
<Skeleton Wolf King> Barebone Baron
(753,327) (471,138)
<Warped Wisewood> Alf
(221,742) (328,719)

Bone Reef Peninsula
<Bone Reef Boar Chief> Chupathingy
(678,863) (634,945)
<Bone Reef Scorpion Boss> Reef Ravenger
(326,160) (311,343)
<Red Ringer> XBX3600
(390,344) (588,433) (247,322)

Angoya Island
<Tropical Sunbird King> Boco Cabana
(607,584) (722,580)
<Boss of the Hunt> Striped Tawny Leopard
(821,935)
<Reef Dragon Boss> Corsair Dragon
(381,256) (338,330)
<Primo Pig> Boaris
(767,664) (629,677)
<Stone Colossus> Jalmano
(698,971) (782,1016)

Land of Sighs
<Servant of Sighs> Lithic Lizard
(690,1160) (675,1069)
<Wooly Wasteland Wanderer> Tumbleweed Yak
(473,825)
<Peerless Hurricane> Eilenberge
(477,249) (429,402) (441,463)

Scorching Wind Desert
<Desert Tarantula Queen> Weeping Widow
(325,60) (438,109) (685,73)
<Young Dragon Boss> Draggy the Kid
(729,446) (684,434)
<Scorching Wind Lord> Dunewalker Scorpion
(358,477)
<Cute Stray Dragon> Luke
(618,53) (525,88 ) (689,54)
<Desert Death Dragon> Nazrudin
(357, 171) (504,210) Circles around Bath City Ruins

Misty Wetlands
<Misty Jelly Rabbit King> Pipeppo
(528,284)
<Terror of Vacations> Piercing Proboscis Wasquito
(68,520)
<Water Spirit Queen> Eifellina
(711,710)
<Wicked Wink> Albiete
(50,97) (103,175) (56,262)
<Great Misty Marsh Tree> Surbora
(133,725) (253,678) (267,561)

Lost Highlands
<Lost Elk Chieftain> Grand Highland Stag
(1001,332) (877,509)
<Cactus Wolf King> Savage Scarlet Wolf
(417,545) (386,373)
<The Yak Attack> Great Red Yak
(653,84) (214,209)
<Wild Wanderer> Derek
(454,120) (300,129) (401,98 )
<Lost Phantom Dragon> Utumno
(957,613) (682,522) (500,419) (455,340)

Gaia Woodlands
<Gaia Woodlands Monarch> Chronos Forest Sprite
(349,77) (437,163) (503,83)
<Goddess Lake Bear Boss> Primal Brown Bear
(593,731) (588,565)
<Toxic Flower King> Ageless Anger Flower
(938,922) (1112,764) (1119,548)
<Everlasting Servant> Ramos
(339,767) (423,731)

Blakatoa Range
<Blakatoa Wolf Chief> Pale Death Bone Wolf
(1119,434) (867,414) (1159,484)
<Minor Dragon Lord> Sundance Kid
(969,778) (1069,854)
<Volcano Spider Boss> Blackrock Tarantula Lord
(610,92) (659,70) (453,80)
<Remorseful Deserter> Augustine
(797,643) (629,655) (621,722)
<Dragon of the Fallen Star> Aschenbrand
(433,74) (347,128) (318,223) (250,304)

Prism Island Prairie
<King of the Grasslands> Grand Prairie Stag
(910,222) (812,249) (803,210)
<King of the Mountain> Great Horned Goat
(1628,458) (1693,555) (1730,494)
<Lady Killer> Pinch
(1624,93) (1478,119)
<Abyss Golem> Ulgioth
(382,83)

Twin Lion Mountain
<Beast Turtle Boss> Sharptooth Tortoise
(336,723) (371,764) (478,688)
<Fire Lord> Blaze of Greed
(860,538) (932,625)
<Cutey Badass> Kamujo
(202,354) (183,303)
<One-Eyed Evil God> Foras
(741,561)

Knight Valley
<Snow Faerie Leader> Gemmie
(41,550) (111,534) (140,484)
<Mohawk Madness> Pigmalion
(465,546) (466,611)
<The Word> Birdbird Bird
(263,350)

Eternal Mountains
<Freezing Wind Spirit Elder> Stratos
(375,169)
<Monstrous Tidal Worm> Madness Maw
(168,413)
<Eternal Hunter> Wika
In the general area of (52,451) – (249,473)
<Invincible Iron Ape> World's End Six
(884,377)