From Battlerite Wiki
Due to having a lot of invulnerability frames Jumong has been hard to counter for certain setups. Jumong's overall performance is currently around average but he is still perceived as a very strong Champion. In this patch we reduce the value of some of his defensive abilities and Battlerites while we increase some of his offensive power. The biggest change is the removal of immaterial status during Prowl. Prowl offered little counterplay, with this change it will remain a powerful tool but won't be a guaranteed out. The EX version still grants immaterial status. A cast time reduction on Steady Shot along with a buff to Power Shot should open up for more battlerite builds while also boosting the effectiveness of double casting Steady Shot.
Jumong has been very popular since his release and is so far performing slightly above average. The value per energy on Jumong's Rain of Arrows has appeared to be a tad high and thus we're reducing the power level of this ability while we keep a close eye on his continued performance.