Not a single Talisman dropped when completed the crazy incremental wisp powered monster

Was in the Assembly map and encountered a wisp. Followed it and it empowered a rare with 4 wisp modifiers.

Killed it and it respawned, with an extra wisp modifier. Killed it again and another respawned with another modifier. Repeat killing it for many times (>6) and finally the respawn ended. Lots of loots (many tier 5s but useless gear for my build) but NO talismans.

So disappointed - not that the talismans are any good anyway.