The Defense skill tree (Secutarii Siege Axioms) for the Tech Adept is the same as the Crusaders.
Namely the branch abilities
- Shield Mastery: +50% Deflect from Shields.
- Bulwark of Zeal: +5% Damage Reduction for 10 sec on Spending Focus Points.
Tech Adepts don't have Focus points and can't use Shields.