The Minogame's Protection legendary amulet in Assassin's Creed Shadows increases damage for empty Armor slots, so Yasuke is better off naked.

Here's a complete walkthrough for the Megalithic Vault in Assassin's Creed Shadows, including its location, and all Megalithic Vault rewards.

Yasuke is one of two playable characters in Assassin’s Creed Shadows. But unlike the other protagonist, Naoe — the stealthy shinobi who bears the iconic hidden blade — Yasuke is conspicuously absent during the first part of the game.