Quick Answer
Ratna is a Magic and Crit-focused carry/support whose best specialization depends on the run. Fashionable had the strongest recent pre-Endless signal before a 0.5.3 nerf. Magnanimous has the best-defined hyper-scaling and deep-Endless identity. Ostentatious is a Mage/Mystic support route that deserves retesting after a direct buff.
How Ratna Works
Ratna's core offensive idea is Starfall. The material says Magic is her central damage stat, and kills can permanently add more Magic. This makes cast access, Crit, and protection very important.
Ratna is a ranged carry-style hero, so survivability still matters. A dead Ratna cannot secure kills, gain permanent Magic, trigger Stun, or scale Magnanimous. Keep her protected behind a reliable frontline.
Specializations
Fashionable adds item-slot and item-rarity scaling. It gives Ratna immediate stats through high-rarity items, including Magic, Mana Regen, and HP/S in the material. Patch 0.5.3 nerfed its HP/S and Mana Regen per rarity, so old praise should be patch-stamped.
Magnanimous is the Assassin hyper-scaling route. It adds extra Starfall hits, low-health targeting, Stealth on kill, and permanent Crit on kill. Ostentatious is the Mystic support/Backup route that helps team Magic and Mana Regen.
Best Stats and Teams
Ratna wants Magic, Crit, Mana Regen, Starting Mana, item quality, and enough survival support. Fashionable cares about item rarity. Magnanimous cares about securing kills early enough to snowball. Ostentatious cares about teams that can use Magic and Mana Regen support.
Good Ratna shells include a protected hyper-carry build, an item-quality Fashionable build, and a Mage/Mystic support build. Do not publish one universal #1 Ratna specialization. The material is explicitly situation-based.