User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-116.87.40.218-20160201093748/@comment-139.255.58.50-20160202043040

The batch name is "The Sin-bearers". They start from *4 form. All of them are Elgaian prisoners that was sent to investigate Ishgria but abandoned afterwards

Here's the translation : https://www.reddit.com/r/bravefrontier/comments/43mpyt/bfjp_291_vortex_dungeon_batch_the_sinbearers_lore/

In short about their death :

- Rahsu / Ross pawned by Shusui in Celgrad - Kairu / Kyle trapped in Wulgee by Melord and touching crystals in Demon Cavern Feig - Hainesu / Hainess killed by Mordlim in Rakshult - Ruzeon is deserted in unknown place, probably in Beiorg ? - Alicia is fooled by Mora who claim herself Lucius' disciple. LoL - Jeido / Jade is killed by Bariuon in Fal Nerga