Alacrast was the setting in SW1.0. It has since been replaced in SW2.0 and 2.5.
SW2.5 is a solid and flexible fantasy RPG. I would play it over the likes of 5e, Daggerheart and other modern D&D fantasy equivalents. It won't cover Alacrast as said, as SW2.5 has its own setting, which is also...