Warlock moved to 2/3 caster, like some classes were in 3.5
that gives new spell levels at class levels: 1,4,7,10,13,16,19(7th level max). Long rest recharge.
EB deals 1dX damage, +1dX on levels 4,7,10,13,16,19. X depending on type of EB
as
@mellored mentioned EB should have;
single target ray ranged spell attack, 150ft, 1d8 damage,
5 or 10ft burst at 60ft 1d6 damage, dex save
melee spell attack, 1d12 damage,
15ft cone 1d10 damage, dex save
invocations could add 10 push, pull, half speed speed or similar.