The few Exotica (naga x bongso) hybrids we’ve seen produce very dark pitchers. Some appear almost black!
Intermediate conditions preferred. The main image shows the parents. Seed-grown.
This plant prefers intermediate/highland conditions. It should be kept between 80-85F in the day and may benefit from cooler nights in the '60s. Nepenthes can acclimate to lower humidity levels, although the best results will be seen with a relative humidity range between 70-80%. Bright, indirect light, and pure water.