well, i finally finished to buy whatever i needed from rahab shop without using any half elixers, and now starting with medusa.
i need 1 copy of the glaive as it's already with 2 stars (and as i found 1 copy last even i need less mats to buy it)
the 20 half elixers and ofc the black and gold books so i don't think i need to burn much half elixers for it.
*sigh*
also used 2 premium and 2 kamihime weapon ticket and got just 4 R weapons....
oh well, i'll use them as materials to level up skills.