I do not believe that hoid shattered the shard......because if you pay attention in the WoR, in the letter part, that the friend (master of the 17th shard) mentions to hoid that 'Rayse desired the shard of hatred', specifically-"He bears the weight of God’s own divine hatred, separated from the virtues that gave it context. He is what we made him to be, old friend. And that is what he, unfortunately, wished to become."(chapter 71-Vigil). So, it is almost impossible that hoid himself shattered adonalsium-the more probable theory is that he was part of the team, that included rayse, who took it upon themselves to shatter or destroy adonalsium for some reason they believed to be righteous, but later on, after the other members of the team picked up the broken shards and acquired there current persona, hoid came to the conclusion that what they did was wrong or incomplete, and so is currently pursuing his goal..........the final end of the cataclysm that he and his friends started.