How it's unlocked

Write the requirements as a distinct move, as a checklist, or as part of the arcanum's initial move(s). These requirements might involve…

… successfully using one of the arcanum's starting moves __ times;
… rolling a 6- on one of the initial moves __ times (suffering the consequences each time);
… paying a certain cost __ times;
… collecting specific items or bits of lore;
… performing certain tasks or rituals;
… spending weeks practicing/studying/ contemplating the arcanum;
… experiencing some extreme event(s);
… some combination of the above; or
… anything else that makes sense.