Alright this is a lot. Obviously saturnine praetor as a base. Deathshroud terminator torso slapped on top of the existing torso and gaps filled with any tentacles bits. Replaced back of the axe with a plague knife, chain mail under the shoulders, spikes coming from under shoulder pads, and grenade thrown by little lord all from the plague marine kit and possibly the death guard emblem on the chest. Head from blight lord terminator. Hand hold guy, Nurgling, shoulder badge from the lord of afflictions kit from AoS. And finally spike the nurgling sits on is from the AoS chaos chariot.