Hikari gulps when she sees the incoming monsters. "I-I guess I should've expected this..." Hikari says. She takes a deep breath. "Ivory, you still with me?" she says, seemingly to thin air. "Of course, Hikari." says an echo-y, female voice. An armored figure appears next to Hikari, holding a spear. "Shall we get started?" Hikari nods, extending a hand to the phantom - Ivory, presumably. Ivory, rather than, say, shaking the hand, gives Hikari the spear. Hikari grips the implement of battle, and as she does so Ivory seems to sort of... fade, a trail of energy linking her to the weapon and to Hikari. By the time she's gone, the weapon seems as real as Hikari, and beyond that Hikari herself has changed. Hikari herself is notably taller - around 7 inches by the imperial system that several of the party would know - and has grey streaks in her hair, and her nondescript clothing has morphed into green-tinted armor.
Auto-support will use Tarukaja/Rakukaja, target Hikari and Sachi with a Res boost, and Hiroki with attack boost.
Hikari will cast Rakukaja on Theo.