Riven FLST resources
From A look inside The Link @ wiki
Probably they specify which SFXE resource this card must use. They are very often empty (no SFXE for that card) or with only 1 record. The record size is 6 bytes:
unsigned short | index | Record index, starting from 1 |
unsigned short | sfxe_id | Resource ID of the corresponding SFXE |
unsigned short | u0 |
u0 seems always zero. Changing it seems to have no effect.