As in the first game, you must collect Runes – located using Empress Jessamine’s heart – to upgrade your powers and skills. Bone Charms, meanwhile, proffer other advantages, such as increased climbing speed, greater lung capacity or unnerving enemies to the point at which they more regularly fumble a grenade throw. Now you can also craft your own Runes and Bone Charms from raw whalebone that you find around the levels. You can build in up to four traits, and even stack the same one for additional potency, but before you fully upgrade your crafting ability there’s a chance of creating a corrupted charm. These imperfect carvings offer advantages that come with a cost: Armored Bones, for example, reduces both the damage you take but also your movement speed.