100 jewel is the intro + sex scene once lvl 40 (for SSR) both give 50 each. (As for the use of jewel it's pretty obvious, only need decent luck ... In my case i got Acala, Satan and Takemikazuchi with jewel, i had sol and metatron for starter which were gotten after exactly 50 reroll ...)
Thank slashley, i'll do rahab a little, i wasn't able to do expert but i got Nemesis few day ago which is quite the heavy hitter and thunder at that. That should helpful. For Disaster of light i'm already doing that already just no luck, well ... i open a raid with my alt, send request on union only and join with my main. Being low and all i get actually get beated by my alt and if someone from the union join i don't get the mvp lol. My alt got Ifrit, Ares so yeah cannon glass road lol. I'm not sure any kamihime on my alt account is above 0* and yet all my own light girl are 45+ xD i need a light eidolos ... Diabolos is definetely too weak but still better than most light R 0*. I do keep a SR light spirit but only 0* i don't find it worth the lost of stats (not than diabolos got a lot of stats ...) But if i get the light spirit 4* then 25% Atk/HP for light would be a lot better xD
As for union event i don't know when exactly an union start being considered strong, as i saw rank 110+ something on nightmare raid boss last week. In my case i am among the lowest lvl, i was the lowest when i joined lol, the top having few 60+ and some 50 ish.