Do not bring low-tier swarms unless you plan to merge them immediately. The Sibling's base has high damage output; low-tier skeletons will die before they reach the wall.
Have at least 4–6 Level 1 Cannons on the board before you sleep. Day 2: The Cannon Barrage sibling rivalry necromerger guide repack
This guide will provide a complete walkthrough, focusing on the "Repack" method: a hard reset of common mistakes, efficient merging, and exploiting the Cannon vs. Catapult meta. Do not bring low-tier swarms unless you plan