A warlock chooses an otherworldly patron at 1st level, and the Archmage is a new option for that feature.

The Archmage

Though they may not be physical gods or extraplanar leviathans, the most powerful spellcasters can approach a level of skill and raw might that well exceeds the typical mortal experience. In the quest for enlightenment and true understanding of the cosmos, certain of these mages find themselves in need of other, lowlier agents to go about the physical world whilst their consciousnesses swim through ethereal seas.

You have made a pact with one such archmage, receiving a portion of their unfathomable power in exchange for a service rendered, loyalty given, or otherwise fulfilling one of the mage's needs. Your patron may be a court wizard in need of eyes across the empire while they spend their time researching. Or perhaps a secretive lich sold you a seed of their spellcasting in exchange for the last holy relic needed to complete a phylactery. Arcanists such as Mordenkainen, Acererak, Melf, and even deities of magic like Mystra are all examples of beings capable of forging such pacts. Whoever your patron is, they have given you a shortcut in arcana that they may have never had, which could be either a sign of goodwill—or an omen of inevitable envy.

Expanded Spell List The Archmage lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you. The Archmage Expanded Spells Spell Level Spell 1st identify, shield 2nd blindness/deafness, enlarge/reduce 3rd glyph of warding, sending 4th greater invisibility, watery sphereXGE 5th Bigby's hand, cloudkill