Karam is a Force affinity epic from the Undead Hordes. Karam was buffed in January 2021 to not use his poison explosion ability against the Clan Boss on auto. With a reasonable chance to land poison on his A1 he becomes a mid-tier prisoner however without any other true utility he will not go beyond that.
He is the wrong affinity for Ice Golem 20, and you should have a better poisoner for Clan boss you can bring into Dragon 20.
The strongest skill for Karam is his A3, potentially a boss slayer in areas such as Doom Tower but he needs to be paired with champions that lay a lot of poison, like Taurus or Dracomorph.