I've been wondering about how Odium has been killing and splintering other shards and I've been thinking that perhaps it's something that he achieves through manipulation and cunning instead of any kind of weapon or brute force. I think it's implied that Ruin would've splintered Preservation's power after he had killed Leras, had Kelsier not taken it himself. So it would seem it's not any kind of weapon or specialized power that Odium developed for himself. I'm thinking that maybe he manipulates events and creates situations where a Shard will be driven by it's intent to invest away enough power that Odium can then kill it's vessel without being destroyed himself. Sort of how Preservation was driven by his need to preserve into severely weakening himself in order to contain Ruin. He was then a mere shadow of himself and Ruin was able to kill him finally once he broke free. Rayse is described as being an incredibly cunning man even before his ascension. Now with a Shard's powers and foresight, it seems plausible that he would be able maneuver other Shards into a corner using his knowledge of how their intents will drive them to behave.
