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Rethiarius the Sentinel

As part of the Expedition to the Barrier Peaks campaign, my PCs took on their first boss.  8 PCs and 4 Henchmen/NPCs with an average level of 6.  The boss was a Rubik-like cube robot/mechanical entity called Rethiarius.  Corrupted by a creature known as a Telepath (a reskinned mind flayer, inspired by Prey 2017).  The cube fight was inspired by similar enemies in Skyforge I encountered back in 2017/18.  I used zone combat for the fight, and it worked very well.  I am using World Anvil to run my games now, and you can find the boss statblock here and the zone set up for the fight here.

Posted in 5e, Dungeons & Dragons, Encounter, Expedition to the Barrier Peaks, Monstrous Compendium, Science-Fantasy, The Ninth World

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