You can summon Shambling Corpses using your Second Circle.

Make a Spellcast Roll against a target within Far range. On a success, your Shambling Corpses move to attack the target, dealing 5 physical damage for each Shambling Corpse before returning to you. One Shambling Corpse then disappears.

You can summon Ghosts using your Third Circle.

While you have any Ghosts summoned, your Evasion has a +1 bonus as they swirl around you in protection.

You can summon one Death Knight at a time using your Fourth Circle.

When you succeed on an attack roll with Hope, you can instead succeed with Fear, causing your Death Knight to rush your target, add 2d12 to the attack’s damage, and then return to you.