The vampiric healer, the original support frame, lobster skirt - Trinity!
Passive: Trinity and allies in her Affinity Range gain Lifegiver, which increases their Health equal to 50% (25% in Conclave) of Trinity’s total Energy pool.
Well of Life - Create a well of life on an enemy who will absorb Status Effect damage intended for nearby allies. Allies gain additional Health when they attack the target. If allies die, enemies in the well of life die in their stead.
Energy Vampire - Allies will gain energy over time when enemies are marked with Energy Vampire.
Link - Any damage taken while Link is active will be channeled to a nearby enemy.
Blessing - Restore the health and shields of allies within Affinity Range while reducing the damage they take from enemies.
Acquisition: Main blueprint can be purchased from the Market. Component blueprints are obtained from defeating Ambulas on Hades, Pluto.
The other Hex frame that received a touch-up with 1999, while I was very much impressed with Nyx I can’t say the same about Trinity. She’s in a strange spot where her support skills are good in a vacuum but Warframe is not really a game where her specific way of supporting really shines. She can allows you to be incredibly greedy for energy, not care about status effects or enemy damage, but those are things most Warframe players already take into account when making their builds. A good build doesn’t need external sources of energy, healing or survivability - that’s what makes it good! If you knew you always had a Trinity with you, you could change your build to be really greedy but Warframe doesn’t have any content that requires or incentivizes pre-build groups with select Warframes anymore. In most actual content with random players a more generic support like Wisp will be far more useful.