The primary attribute recommended for this build is Intelligence. This is because all of the build's damage is based off of Intelligence, making it crucial to have this stat as high as possible for maximum spell damage output.
This video provides a comprehensive guide to a Necromancer/Warfare build for Divinity: Original Sin 2, focusing on effectiveness in Acts 1 and 2, and up to around level 10. The presenter details attribute and ability point allocation, essential talents, recommended gear, and a variety of skills. The guide also includes combat strategies and tips for maximizing the build's synergy between necromancy and warfare for both damage and crowd control.
The key talents suggested to maximize the effectiveness of this Necromancer/Warfare build are: