Life, as far as we know it, needs a solvent for the biochemical reactions that form the basis of the life to take place. Here on Earth, that solvent is water, and the life is carbon-based because many carbon compounds are water-soluble. Ammonia is another postulated carbon-based-life solvent, which we see in abundance in ED. Methane is another possibility, but liquid methane is even colder than liquid ammonia and lacks the polarity of water and ammonia, limiting the solubility options. The earlier FFE/FE2 games had "methane weather system" planets, ED lacks them (Titan, for example, should be a methane planet), though ED does have those strange reddish planets with large black "lakes".
The main problem with "silicon-based life" is the lack of solubility of silicon compounds in any solvent that's likely to form naturally in bulk on the surface of a planet. Perhaps the "molten planets" with glowing red lava lakes might be your best chance to find silicon-based life. Planets with "silicates" atmospheres also might help. Such lifeforms, of course, would not be comfortable on an Earth-like planet or water world.