Enlightenment is a Runeword "PulRalSol" in Diablo 2 Resurrected (D2R). It requires these 3 runes to be inserted into a socketed item in the exact order:
Pul +
Ral +
Sol . The eligible bases for Enlightenment are the following:
Body Armors . This is the only Runeword in the game that has X% Chance to cast Level X Blaze when struck attribute.