Surtlings are tiny imps constantly engulfed in flames. You will gather Surtling Cores before ever seeing a surtling in the wild. Surtlings are not especially dangerous and will die when coming into contact with water. They spawn at Fire Geysers in the Swamps and during Surtling Invasions.
Surtlings have very low health and die instantly to most attacks.
Surtlings only have one attack, a fireball that explodes on impact and inflicts burning.
Even their damage is negligible as long as you’re not eating tons of their fireballs. They are more difficult to engage with melee because their fireballs have high knockback and are almost impossible to dodge at close range.