In addition to will, Trazyn had an infection algorithm that could, properly inserted, lay the groundwork to make almost any necron a temporary surrogate. Well, not any necron. An unprepared overlord, certainly. One who had lapsed in their security protocols. Crypteks were often out of reach due to their technomantic defences.
But a mere ark helmsman? Almost too easy. Especially with the Yyth Seer revealing where and when to intercept Orikan’s strike force.

The Infinite and the Divine