I did want to finish up Root Earth but it was way too late, so I had to call it there and then.
I will upload the next video completing Root Earth and finishing up Apocalypse Difficulty.
So far, there has been no deaths. I do feel confident with this build and will proceed with it through Root Earth.
My Build:
Class: Die Hard Guardian (Challenger/Medic)
Long Gun: Merciless
Hand Gun: MP60-R
Melee Weapon: Krell Axe
Relic: Tranquil Heart (Regenerate 2 Health per second, upon use, doubles all Health Regeneration for 15 seconds)
Armor: Leto Mark II set
Amulet: Twisted Idol (Increases Armor Effectiveness by 30% and Decrease Armor Encumbrance by 15)
Ring: Black Cat Band (Prevents Fatal Damage every 2 minutes)
Ring: Dead King's Memento (Increases Health by 15)
Ring: Hardened Coil (Additional 3% damage reduction per 10% missing life, up to 15%)
Ring: Ring of the Robust (Increases Health by 10 and Armor by 15)
Concoction: Mudtooth's Tonic (Increases Health by 25 for 60 minutes)
Traits:
A trick here is to keep Challenger as Prime until it activates, then swap to Handler when you can to gain that Prime. This way, if you go down again your dog have a decent chance to revive you if it doesn't get cancelled or downed during the process.
There are other Archetype options too to choose from. Such as Alchemist, Engineer, and Summoner, feel free to test them around and see which style fits you best.