@Md. Anisul Islam That's assuming that the regeneration doesn't drain the troll's stamina too badly. If the goal is to win via attrition, forcing the troll to endlessly regenerate until it collapses is likely a solid tactic.
@Prinzinc Let's hope so. If the troll's regeneration is a passive thing with no stamina consumption nor any drawbacks, then MC is about to have a fight he won't forget that's for sure.