Surpassing 15 Star Tyrant Equip

Just a hypothesis from my own experience, anyways : you would lose all stars on that SW cape and only keep the scrolled stats.
Honestly I have got no clue what you're asking.

ok tell me what will happen to the gear I will tell you

I going to use some ee on my gollux pendant which is + 8 and it stats is 52 to all and 37 attack

I use 5 star using reg ee or aee on it and I fail to get any good stats it stats is still 52 to all and 37 attack

now time to starforce and it still 5 star atm and I use starforce and I fail now it 4 star? will I lose stats base on random reg ee? or will I lose stats base on starforce preset?

what happen If I break that item ?

and u will get a the same stats as scroll? nope

u will lose stats instead cuz the preset of the star is 5 and that is 15 stats ur new gear will become weaker that why reg ee and aee suck it ruin starforce