Very Easy AFK Titan Solstice Armor Farm - Elemental Orbs & Final Blows
I found this by accident while doing my Solar Melee final blows... which ironically don't count towards that requirement. Load up The Whisper mission on IO, go through the mission until you hit the green room, go in the basement, sit in the corner with bottom tree Solar and melee a thrall. They continuously spawn and reproc your Sun Warrior and Sol Invictus talents.
I found this by accident while doing my Solar Melee final blows... which ironically don't count towards that requirement. Load up The Whisper mission on IO, go through the mission until you hit the green room, go in the basement, sit in the corner with bottom tree Solar and melee a thrall. They continuously spawn and reproc your Sun Warrior and Sol Invictus talents.