Finally beat the Primordials double battle. The merged pet is Baby Chimera (15-20 nature damage level 1). Kinda depressed that you need to beat the primordial 3 times to get "Chunk of Void Radiance" which is required to upgrade everything ...
Level 85 necklace has: Melee, pierce and magic +5, block, parry and dodge +10, bonus +8, crit +8, WIS, end +5, CHA, LUCK +11, INT, DEX, STR +13 (dunno about all as I havent merged it
Level 85 ring: Melee, pierce and magic +5, block, parry and dodge +5, bonus +8, crit +8, WIS -7, end -7, CHA, LUCK, INT, DEX, STR +7 (dunno about all as I havent merged it
Strategy I used was normal DMK with Sir Leon and Artix from Guest book and Stan the Orb.
Equipment: Ultimate Blinding light of destiny, Goundhog wings IV, doomknight helm, Unhallowed deathknight circlet, unhallowed deathknight amulet, spiked leather guantlet, leorilla mane belt IV, legion bracer
I start off the battle by pressing The Ritual on The Witness so that I have Inner Darkenss ready for the tentacle monster when he gets his debuff. Sir Leon then stuns Squirrel. I used corrupt and stan on the tentacle so that Artix and Sir Leon use their light damage on tentacle guy. IMPORTANT: use shape darkenss on DMK on tentacle guy because it does 400-600dmg always. Keep healing when required. Then when tentacle guy has -100+ resistance and has no buff to his dodge, parry, block; use your whole combo (inner darkness + Sir leon crit + Artix skill (he only has 2 skills inclusive of the heal).
Once you kill tentacle, the squirrel is annoying. Once you've killed him 2 times and reaches 50% health. He has a huge nuke by turning into death which essentially 1 shots you. So you NEED to use malefic binding on him or void barrier.
Hope this helps. I'll try finish the battle 2 more times.