This facility allows you to summon random 4* from a fixed pool of R-grade heroes for 300,000 Gold per summon. You can attempt up to 5 times daily, in which the attempts will be refreshed along with the daily reset. Once you upgrade this facility to LV2, you’ll even get the chance to pull 5* R heroes instead. This is definitely what you want especially if you’re using them as fodders to evolve your SR or SSR heroes to 6*.