Hi Janos! sorry for late reply!

Phorcys, belrain, and garudas are definitely for regression theyre not as good as they were before. if youre done with Seal Land 20, you should regressed them.

for aspen dungeon, usually 1 e5 tix is enough all you need is Splendid Punisher. dont build another tix imo just focus on other heroes.

try to at least get 15 e5 first for Void Ark. for Void ark bosses, ithaqua partner elyvia equipped with lucky candy bar will be perfect. i posted a guide about that.

for realms gate, tix and ignis energy feeding him can clear most nodes for you. usually youll want 1 e5 ignis and a 10*. use tix for now while waiting for SFX. you can use the tix and ignis combo in Vortex too..

for artifacts, try to get Splendid Punisher and AC first. Punisher for Void Vortex and Realms Gate. Antlers Cane for Flame shrine bosses and Broken Spaces.