Brick by Brick

After being hunted down and shot to death, twins Amira and Hezekiah James are transmigrated into a parallel prehistoric Stone Age world, reborn in the bodies of seventeen-year-old twins exiled from a Neanderthal village. Their souls remain thirty-two years old. Their return causes a stir, sending them to the House of Spirits, where a mysterious journal integrates with their beings and grants an Ultimate Crafting System: the abilities of a block-building game player and builder, plus access to a mod marketplace funded by credits earned through creating. They plan to become rulers of this strange world while facing adversity at every turn. All humans and animals are scaled to exactly 1.39% of their original size, with weight proportioned to match. Insects are crustaceous, retain their full original size, and remain dangerous; flora and the broader prehistoric environment remain naturally scaled. Dinosaurs grow only eight to ten inches tall, making the Stone Age world unmistakably unlike Earth's past. Amira is unsure whether she has traveled through time or into a parallel universe, but the latter seems more likely.