I thought I read the 3x Leg gems to 65 was a conquest, not Guardian? I do not have PTR loaded so cannot check too easily
Guardian is 3 gems to 70. The conquest is 3 gems to 65.
The conquest first appeared in Season 6, when Guardian was also 3 gems to 65 as well. But the conquests haven't been updated since then, whereas the journey was.
Season 27 Journey (taken from PTR):
Chapter 1: Butcher, Siegebreaker Assault Beast
Chapter 2: Belial, Cydaea
Chapter 3: Ghom, Skeleton King
Chapter 4: Urzael (Torment II), Rakanoth(Torment IV)
Slayer: Adria, Azmodan
Champion: Maghda, Izual
Destroyer: Queen Araneae, Diablo
Conqueror: Malthael (Torment XIII under 1 minute 30 seconds)
Guardian: Zoltun Kulle (Torment XIII under 10 seconds)
Conquests:
Softcore: Sprinter, Avarice, The Thrill, Boss Mode, Masters of the Universe
Hardcore: Speed Racer, Avaritia, Super Human, Worlds Apart, Masters of Sets
Guardian is 3 gems to 70. The conquest is 3 gems to 65.
The conquest first appeared in Season 6, when Guardian was also 3 gems to 65 as well. But the conquests haven't been updated since then, whereas the journey was.
Here are the bosses for the season 24 journey:
Here are the bosses that you will need to kill for Season 23:
Chapter 1:
Kill Malthael
Kill Azmodan
Chapter 2:
Kill Diablo at level 60 or higher on Hard difficulty or harder
Kill the Seigebreaker Assault Beast at level 60 or higher on Hard difficulty or harder
Chapter 3:
Kill Rakanoth at level 70 on Master difficulty or higher
Kill Izual at level 70 on Master difficulty or higher
Chapter 4:
Kill the Butcher at level 70 on Torment 2 difficulty or higher
Kill Urzael at level 70 on Torment 4 difficulty or higher
Slayer:
Kill Zoltun Kulle at level 70 on Torment VII difficulty or higher
Kill Ghom at level 70 on Torment VII difficulty or higher
Champion:
Kill Cydaea at level 70 on Torment X difficulty or higher
Kill Adria at level 70 on Torment X difficulty or higher
Destroyer:
Kill Maghda at level 70 on Torment XIII difficulty
Kill Belial at level 70 on Torment XIII difficulty
Conqueror:
Kill Queen Araneae at level 70 in under 30 seconds on Torment XIII difficulty
Guardian:
Kill the Skeleton King at level 70 in under 15 seconds on Torment XIII difficulty
Here are the bosses for the journey:
Here are the bosses that you will need to kill for Season 23:
Chapter 1:
Kill Ghom
Kill Adria
Chapter 2:
Kill Zoltun Kulle at level 60 or higher on Hard difficulty or harder
Kill Malthael at level 60 or higher on Hard difficulty or harder
Chapter 3:
Kill Diablo at level 70 on Master difficulty or higher
Kill Cydea at level 70 on Master difficulty or higher
Chapter 4:
Kill Rakanoth at level 70 on Torment 2 difficulty or higher
Kill Maghda at level 70 on Torment 4 difficulty or higher
Slayer:
Kill the Butcher at level 70 on Torment VII difficulty or higher
Kill the Izual at level 70 on Torment VII difficulty or higher
Champion:
Kill the Belial at level 70 on Torment X difficulty or higher
Kill the Queen Araneae at level 70 on Torment X difficulty or higher
Destroyer:
Kill the Skeleton King at level 70 on Torment XIII difficulty
Kill Azmodan at level 70 on Torment XIII difficulty
Conqueror:
Kill the Siegebreaker Assault Beast at level 70 in under 30 seconds on Torment XIII difficulty
Guardian:
Kill Urzael at level 70 in under 20 seconds on Torment XIII difficulty