10 open slot space for R5 [Dreamer's Wrath] Tennokai
Can slot any tennokai mod up to R4 Guardian Derision
Switch 1 Madurai slot for 1 Naramon and use R4 Shocking Touch for +15% corrosive damage, - ~10% status chance.
Technically higher damage for +1 Forma
(With 2 Naramon Configuration)
1 Additional Forma to Exilus Slot (Madurai) to fit R5 Dreamer's wrath and R5 Shocking Touch together. Result is +30% Corrosive Damage for - ~10% status chance.
The single Naramon configuration is a bit more flexible, and the damage increase overall from the extra forma is fairly minimal in practice (~4-5% more final damage)