The PC will be a close combat class for the entire beginning of their game, never utilizing magical powers unless native to the classes of Monk, Fighter, Barbarian, or other "non-magic using" class. This lasts until the point where a warlock would obtain 5th level spells.
After this at any point during a battle, the DM can state that the PC casts "Eldritch Mind" on themself under guidance from a "mysterious voice." This causes the PC to immediately pass out and go down to 1 HP for 5 turns. At the end of 5 turns, if the player has not died, the PC comes back to consciousness, releasing four Eldritch Blasts at 1d10 each. The PC is now a Warlock at one level above their previous class.
The WIS save is rolled by the player, however, in this case, you want to fail
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