Susanoo
- Duel
** The higher Susanoo's "Fame" (名声) ability is, the tougher the boss monsters that will come to challenge you.
*** Rank/Difficulty Table
In Japanese 壱 弐 参 四 伍 In Numbers 1 2 3 4 5 - Aramitama (あらみたま)
The "Aramitama" option allows you to challenge some sort of special dungeons if I'm not wrong. And these dungeons are apparently time restricted (have to clear them within the allotted time) and requires you to team up with other players (due to their difficulty in clearing).
* The higher Susanoo's "Rekka" (烈火) ability is, the more dungeons you will have access to.
Rekka Level 1 Level 2 Level ? Allowed Entry Into "Dawn"
(黎明)"Chance Encounter"
(邂逅)"The Moment"
(刹那)
And in case you were wondering about Susanoo's "Kongo" (金剛) ability, it merely increases the defense of all NPC Partners such that they can sustain more damage before being forced to retire (when summoned). The higher the level of this ability, the better the defense.