"Moreover, the +2 Crimson Iron Heart Necklace truly only provides an additional one-point charm attribute. Although it has been fused to +2, compared to its initial state, the only change is a partial increase in flame resistance and acid resistance."
Speaking of resistance growth, although acid resistance is of little use to Zhang Yanhang since he hasn't encountered enemies using acid attacks for a long time, he finds flame resistance quite useful.
Whether it was the large-scale Crimson Iron Ant Nest Tarano or the Umbrella Biochemical Test Field, he encountered a bunch of enemies using flame attacks, especially the nuclear strike of the God of Flesh and Corruption, which, generally speaking, can be considered a flame attack.
Of course, flame attacks at most only involve thermal radiation; other types of high-energy radiation and nuclear radiation don't have much relation with flame attacks.
