In order to maximize your chances of getting special hadum boss rush tickets, only exchange your normal boss stamps when you collect atleast 50,000 to 100,000 boss stamps, that way you’ll have more chances of getting those sweet special hadum boss rush, thus, more chances of getting ancient inscribed glyphs.

Also, whenever you have a significant cp increase, choose the minimum multiplier first, so your character can clear new stage levels up until your current cp, that way when you can also maximize the rewards you get when you use the multplier 😉

In my way to get most special hadum boss rush is to exchange every single 30 hadum boss rushes. Our guild mate released that average rate for special hadum boss rushes is 1/30, 30 exchanged hadum boss rushes give 1 special boss rushes. But if exchange with all boss stamp same time, the rng will made you down, sometime you will get fewer than rate 1/30 , my guildmate got suffered with rate 1/40 (40 br for 1 special br) and only said f PA. Otherwise you will get more special boss rushes than rate 1/30 if you exchange every single 30 boss rushes. i usually got with rate 1/25- 1/27 (25-27 br for 1 special br)

So i suggest that you dont need to want until have 100000 boss stamps before exchange. Just exchange every 30 boss rushes.