Rod of the Pact Keeper +2

Rare

Rod, Major, Rare (Requires Attunement by a Warlock), 2 lbs. While holding this rod, you gain a +2 bonus to spell attack rolls and to the saving throw DCs of your warlock spells. In addition, you can regain one warlock spell slot as an action while holding the rod. You can't use this property again until you finish a long rest. Source: DMG, page 197

Cape of the Mountebank

Rare

Cape of the Mountebank Rare This cape smells faintly of brimstone. While wearing it, you can use it to cast the dimension door spell as an action. This property of the cape can't be used again until the next dawn. When you disappear, you leave behind a cloud of smoke, and you appear in a similar cloud of smoke at your destination. The smoke lightly obscures the space you left and the space you appear in, and it dissipates at the end of your next turn. A light or stronger wind disperses the smoke.