Hellspawn Staff is the 21st most-used weapon under the current filters (1.4% of 988,658 recorded fights), winning 69.4% overall - 3.9% of its wins come against better-geared opponents.
Best against Divine Staff (100.0%), Great Holy Staff (98.7%), Ironroot Staff (96.1%). Struggles against Bow (39.2%), Dawnsong (44.6%), Prowling Staff (46.9%).
Winrate by IP difference (50-IP buckets, dot size = sample size). A flat curve means the weapon carries regardless of gear; a steep one means it only wins when out-gearing.