No it most certainly is not. No mod should ever acknowledge the existence of Arkanis Gath. Because Arkanis Gath is lame. He's a quick hack to keep players from being stuck in an unfinishable game. In fact, his name should have been simply "Game Unfinishable" because it's not as if he could break the fourth wall more than he already does. (Tangentially related, using Arkanis Gath as an argument for why "Chloe wuld totaly di3!!!!11!1" is rather absurd.)A perfect idea ...How about the chance to stop Chloe before she goes too far, and then Renal Killing you all, or at least Chloe, if you allow her to be so rash. For good measure, Arkanis Gath can do it.
But I particularly felt the need to comment because the ramifications could affect much more than just Chloe. I dream that someone someday will make a mod eliminating any need for Arkanis Gath, allowing the player to arbitrarily slaughter Shadow Thieves if that is their wish and still finish the game. But if lots of modders make content for this fellow who amounts to little more than an avatar for the developers, that's less likely to happen. (Assuming it hasn't already happened and I need to get out of my bloody cave. ...And someone needs to tell me where I can find it, of course.)
But touching briefly on the excessively technical lengths some people have gone to in arguing over the Renal dialogue, one could bring up that as a quasi-deity Chloe would have a lot more power than just what super-human Dexterity gives her. All of her stats should probably be 14 at the lowest, 18 average, and she'd have immunity vs. damn-near-everything on top of that (most likely including poison).