This is what I've gathered so far from looking at all the logs from here, Discord and Steam:
Conditions:
- Akash'Thriya in team
- Play in Nexus of the Void
- Bring Akash'Thriya down to less than 10 health, and then healed to full
- Akash'Flora must be played and cannot be destroyed
- At least 4 different seeds must be played from environment/Play at least (H) seeds from the environment
Conditions that can be eliminated:
- No requirements for any other heroes
- No requirements for any villian
- No requirements for Akash'Flora to be at a particular health
- No requirements for Akash'Flora to grant any powers
- No requirements for all five seeds to be played
Variables that still need to be tested:
- Is the life threshold at 10 hp?
- How many seeds must be played?
- Must the seed condition be unique seeds?
- Must the seeds be played by the environment?
New logs show that Akash’Flora cannot be destroyed, I’ll be editing my post above to reflect that.
As for the second point, seems unlikely to be a condition as in my unlock, Akash’Flora only healed Akash’Thriya for 1hp before ending, and Akash’Thriya only gained a total of 5hp before I ended it
Only one I might be able to help clarify is the threshold. I got down to 9 hp before healing up, so it appears you don't have to go lower than that, which certainly looks like 10hp is the threshold.
As an aside, the dichotomy and reflection between the two Akash'Thriya's is an intersting insight inrto different mindsets of growth and destruction.
The community has discovered the official unlock condition for Akash'Thriya: Spirit of the Void.
Win a game in Nexus of the Void with Akash'Thriya on the team. Each unique primordial seed must enter the environment deck. Akash'Thriya must be reduced to 9 or less HP, then recover back to full HP. Akash'Flora must be in play at the end of the game without ever having left play.
It’s not rough, though it’s a pretty long one. Fighting Amby or Gloomy should be enough so long as you get a team that’s good at healing. Yellow Medico and your favorite Argent Adept flavor will do wonders.
lol actually it was super easy. Dr. Medico, Argent Adept, XPW Tempest, Hunted Naturalist, and A'T vs Ambuscade made it trivial. Everyone was at full health, and the tree was at 35+.
Yeah, I used 'Buta v 'Thrya, Meico, Legacy, Visionary, OmniX.
I used the latter 3 for lockdown, but didn't see Takedown until the turn I finished the bloody game. Legacy punching out Healing Pollen really sped up the healing.