You have 2 options.
Mobius, has a completly free option or paid option : https://l2jmobius.org/
Or Jscripts http://l2-scripts.com/
Although, their older classic versions are really incomplete, I dont really recommend going for the expensive option for these chronicles. Or if you really want to, expect to work on datapack for like 6 months before launching server.
Ive worked for a few people that bought Zaken, Antharas, Secret of Empire from scripts, paid 2~3k dollars for the source code, and still needed to work for 4+ months on datapack before they had something playable
Mobius on the other hand, they have a big community doing alot of the dp work.
The choise is yours.