Hellspawn Staff is the 5th most-used weapon under the current filters (3.1% of 156,859 recorded fights), winning 71.8% overall - 3.8% of its wins come against better-geared opponents.
Best against Ironroot Staff (100.0%), Hallowfall (95.9%), Holy Staff (95.3%). Struggles against Hellfire Hands (40.4%), Rotcaller Staff (41.4%), Lightcaller (45.5%).
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.