Warlock Revisited

The war has not been kind to the patrons that usually empower warlocks. Some saw it as their time to rise and claim the world, only to be met by nuclear fire and other super-weapon that rent them asunder. As a result, there are some changes to the Warlock base class.
The relationship between Patron and Warlock has changed throughout the upheaval. Patrons no longer lord over their warlocks from a position of absolute strength, but one of desperation. The world has been rent asunder, and so too have the basis of their power over it. Negotiations and mutual interest now govern the interactions between Patron and Warlock; and neither side is without teeth.

Level	Feature	Eldritch Invocations
1	Warlock Subclass, Pact Magic	0
2	Eldritch Invocations	1
3	Magical Cunning	2
4	Ability Score Improvement	3
5	Subclass feature	4
6	Patron Boon	4
7	Subclass feature	5
8	Ability Score Improvement	5
9	Patron Boon	6
10	Subclass feature	6
11	Mystic Arcanum (level 6 spell)	7
12	Ability Score Improvement	7
13	Mystic Arcanum (level 7 spell)	8
14	Subclass feature	8
15	Mystic Arcanum (level 8 spell)	8
16	Ability Score Improvement	9
17	Mystic Arcanum (level 9 spell)	9
18	Subclass feature	9
19	Epic Boon	10
20	Eldritch Master	10