world.spell_linked_spell.dbWht about this table (and in general spell_*.db tables in world DB)? It might be helpful. I would recommend using Holy Nova as an example, and make 2 separated spells, where one triggers another one.
Honestly I've no idea how to script spells, but I think nobody can help u without the script you worked out..
Honestly idk. It seems to me that you have either horribly outdated version of core, or something different than TC. In such case its pretty hard ti actually help you with system I simply don't have and know.Tell me you don't use some repack from year 200x -.-.
Arcemu is dead since years. http://arcemu.org/Use Trinity Core.https://www.trinitycore.org/