I would like to talk about bi- and tri-elemental Iskandra. This is my current spec. This was old spec Invoking the elements (1.1.7.1) - the all-mighty Sorceress (EVERYTHING+) . After mines nerf and increasing SR scaling I left “just for fun” spec with Seru and figured out that Ulzuin+Ulthos is the best way now (it has more cs, ms, phys res, HP and the same damage due to Ulthos AoE rr)
What I want to point out:
no frozen core maxed
Even with less %fire damage the fire part of TSS is stronger than cold
What I want to suggest:
Remove lightning->fire conversion and make cold->fire conversion as 100%
Why? For cold+lightning there is Trozan already. The cold part in Iskandra is the weakest one AND its highly inconvenient to get all three RR devotion, 'cause you loose too much for it. But making bi-elemental with Sorc is a good and possible diversity.
You say: “Hey, what about Arcanist Conduit?” It has cold->fire conversion for tss. I suggest to make it lighting->aether to make aether TSS Allagast finally possible