When activated replace this model with a Shell. The Shell is considered the same model as the one it replaced for all purposes. The model gains +1 ARM and Immune: Status Effects (and subsequently Remedy). A shell may not move, attack or use special actions.
When a model with Turtle isrequired to make a defense roll, it may immediately activate Turtle for free before the roll.
If Turtle is active at the beginning of this model's activation replace the Shell with its original model. The model may then act normally during its turn which may include reactivating Turtle.