There are now two dice packs for Realm VTT, both free. The O.D.I.N. Dice Pack brings eight d6: one for each of the six classes with its mark, plus a red and a white one. The Halloween Dice Pack has two sets, pumpkin and bone, both with a grinning jack-o'-lantern on the six.
Both packs work with any ruleset in Realm, not just O.D.I.N. The O.D.I.N. ruleset and modules are listed under Virtual tabletops.