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The proper requirement to gain the powers of a shifting Titan is to drink the spinal fluid of the Shifter. This is revealed on chapter 65. The "Santa" Titan didn't gain any powers because he ate Eren whole. When Eren ate his father, he bit him on the waist, severing the spine and getting access to the fluid. Armin bit Bertholdt on the head.

When Eren ate his father, he bit him on the waist, severing the spine and getting access to the fluid. Armin bit Bertholdt on the head.

The proper requirement to gain the powers of a shifting Titan is to drink the spinal fluid of the Shifter. This is revealed on chapter 65. The "Santa" Titan didn't gain any powers because he ate Eren whole. When Eren ate his father, he bit him on the waist, severing the spine and getting access to the fluid. Armin bit Bertholdt on the head.

The proper requirement to gain the powers of a shifting Titan is to drink the spinal fluid of the Shifter. This is revealed on chapter 65. The "Santa" Titan didn't gain any powers because he ate Eren whole.

When Eren ate his father, he bit him on the waist, severing the spine and getting access to the fluid. Armin bit Bertholdt on the head.

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The proper requirement to gain the powers of a shifting Titan is to drink the spinal fluid of the Shifter. This is revealed on chapter 65. The "Santa" Titan didn't gain any powers because he ate Eren whole. When Eren ate his father, he bit him on the waist, severing the spine and getting access to the fluid. Armin bit Bertholdt on the head.