This pair of broken manacles is carved from the outer layer of a long dead stone titan. Originally made to contain an ancient antihero with the strength of a giant, though later enchanted by a dwarven Runekeeper to make one more resilient and use some of the titan's power.

Titan's form
Once per long rest, after speaking the command word "Krig" and by spending an action the attuned's size is increased by 1 (tiny > small, small > medium, etc.). as per the  enlarge/reduce spell. This effect lasts for a duration of 10 minutes or until the attuned speaks the command word again.
When this effect is activated the attuned's initiative decreases by their dexterity modifier for 6 seconds as they become more sluggish for a moment while they adjust to their new (temporary) size.

Once the effect ends the attuned shrinks back to their original size. The strain of the effect does however leave them with 1 point of exhaustion.

Notes: Titanite shackles, requires attunement