All magics would work on the other worlds provided you knew how to make it happen.
Assuming that you have the proper genetics for it...
Ruin's consciousness—separate from his power—isn't a particularly nice being. But you can't much blame him, as there's very little that is left of the mind that once was. The force of Ruin has pretty well molded the mind to fit with the force's intent.
This seemed to relate to some of what you were posting earlier, so I thought it was worth bringing up. Not really particularly novel information, but seems like it is worth reminding people about.
Now, on to the focus of my post!
Kill him, Ruin's voice whispered. You could do it. Take a weapon from one of those soldiers, then use it on Yomen.
A slight tangent occurs where Vin is disturbed that Reen's voice is actually Ruin's. Then back in:
She ignored the voice, She wasn't sure why Ruin would want her to try killing Yomen. After all, the Yomen had captured her--the obligator king was working on Ruin's side.
Brandon says this about the chapter (in his annotations):
Notice that Ruin's voice doesn't come to her until after she puts the earring back in. As she points out later, his telling her to kill isn't as specific as she's interpreting it. He's just sending her a general feeling that she should kill and destroy; his attention is elsewhere at the moment, watching what Spook is doing.
(emphasis added)
Let's look at the Pool scene. We have one Shard, with a passive mindset, telling Raoden to give up. This is the Shard Pool's influence. But! Raoden received a vision of an Aon. It seems slightly contradictory to have one Shard telling Raoden to die, and then the other showing him an Aon. This is an interesting duality. One giving him a reason to live, the other wanting him to die. Passion/Tranquility, it could be called?
It seems to me that the Dor Shard and the pool could be the same. (though I actually don't think they are, so I'm kind of playing Devil's Advocate. Oh well.) Raoden's mind could just be interpreting the Shard's general feelings and tendencies, but the aon Rao is what it is deliberately sending him.
I dunno. It's just a thought.
The other thing I wanted to mention was a passing confirmation that Ruin and Preservation were humans that predated Scadriel. I've been trying to find it, but I haven't been able to yet. (Grrr. Sometimes I wish that HoA wasn't so darn long). Basicly what it says is that Preservation remembered either what he had once been, or what had once been in general, and wanted it created again. So it seems to me that they were humans from the pre-collapse of Adonalsium, who created humans originally. When Creation shattered, they were some of those who became shards, and remembered what had gone before. Thus all the shards both remember humans (and being human), and the power of the Shards itself has a tendency towards the creation of humans.
Wow. Looking back, this is kind of rambly and not particularly coherent. Oh well. Feel free to poke holes in this.
And yes, I know that some of that was common knowledge.