Tesseract

Overview

Tesseract is the intrinsic of Worldline Zero, an Exotic Sword. While sprinting with full energy, pressing heavy attack launches a heavy blink strike. Defeating a target with the strike lets you use it again right away. The page says blink attacks partially bypass elemental shields.

Press again after the strike to blink a second time, per a secondary source. The Masterwork adds a perk that shortens Tesseract's activation time. Sources differ on how the catalyst drops, so check a current guide before farming it.