u need 3 files for that

1. data/share/action/monster (boss which u want ) the one original i mean from unpacked and 1 edited
2. data/share/ai info.csv edit at boss when u want to lure it edit time when boss spawn put in place of 1 put 30000 and when u want to use it again edit where u putted 30000 put 1 and enjoy ur spawn

u also have to put original action with 30000 at info.csv and edited action with 1 at info.csv