Also, I think its important to tell about the importance of mythrils. Mythrils are the only way to play this game actually free.
It can be used to expand inventory, refresh stamina, continue same stage after a game over and finally, and most important, to collect relics through banners.
This game offers too little equipment through dungeons/events. Its mostly accessory and some 3* pieces. Some celebration events can give out few 5* but its just for special days (christmas, hallowen, etc). Banners is the only place character unique relic is available, and unfortunelly at a crap drop rate:
- 12% chance to get a 5* equipment;
- 25% chance to get a 4* equipment;
- 63% chance to get a 3* equipment.
Every banner has featured items with increased probability to drop them: for example, current Lightning banner feature Peacemaker, and just in that specific banner Peacemaker has a whooping 1% chance to drop. It will be near zero in every other banner (for example, you wont get Peacemaker in Edges banner).
Considering the limited amount of mythril (mythrils are given daily but just 1 per day plus 2 per week, them its just as one time rewards in dungeons. Aside that, you cant actually farm it forever) its The best to save them to try your luck to get one of the trinity relics, or an extremelly strong SB. You can check upcoming relics here:
http://bantha.org/%7Edscotton/ffrk.html
The very best solution would be saving all mythril till SSB celebration banners, but its a long way ahead. What I can advise you hope is:
- Sephiroths Yoshiyuki, very strong SB;
- Eikos Golem flute, AoE Cura+hastega.
Relics are the most controversial aspect in this game given how bad are the odds to get a single wanted relic (1%): its not uncommon people hoarding ~500 mythrils and failing to get that weapon, then quitting the game. As well, some lucky that pull that weapon in a single pull and starts loving the game.
The Secret is to use mythril wisely, preferably when there are more than 1 good items.