After SoTT patch and potentially with the introduction of Javelin, all melee/range hybrid weapons now can trigger lvl5 talent with their melee attacks.
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Javelin
Melee poke can trigger lvl5 talents, range javelin throw cannot trigger any lvl5 talent. -
Rapier
Before: Melee attack can trigger lvl5 talents, pistol shot can trigger THP on kill and on crit.
After: Melee attack can trigger lvl5 talents, pistol shot cannot trigger any lvl5 talent. -
Blunderbuss/Grudge-Raker/Griffon-Foot
Before: Melee bash attack cannot trigger lvl5 talent, nor does range shotgun attack.
After: Melee bash attack can trigger all lvl5 talents, range shotgun attack still cannot trigger any lvl5 talent.