Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Shadowfast
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Once per game, at the start of any of the High Elf player's movement phase, Gilead may enter Shadowfast. Until the start of his next turn, Gilead's stat line will change to his Shadowfast characteristics. In addition, while Shadowfast, Gilead also gains the Always Strikes First and Dodge (4+) special rules due to his inhuman speed.

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