Heron Spear is the 36th most-used weapon under the current filters (0.8% of 712,600 recorded fights), winning 51.8% overall - 9.1% of its wins come against better-geared opponents.
Best against Great Arcane Staff (91.3%), Hallowfall (90.1%), Heavy Mace (90.0%). Struggles against Lightcaller (19.4%), Prowling Staff (23.5%), Flamewalker Staff (26.1%).
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.
