I dont understand why it needs a nerf, its the same familiar you get in d&d, its not a normal familiar, its a lvl 3 pact boon familiar, you dont see it now as you dont have the options but you are loosing a lot, for choosing that familiar.
In the end the warlock will chose between:
- imp familiar, is good yes a lot, has invis, flight and damage (a spider, bat or crow familiar is also really good for exploring, not for damage. The hunter animal companion is better for combat)
- a book that lets you cast rituals from ANY class and gives you free cantrips of other classes (this is considered the stronger option in general in p&p)
- free magic weapon that can be summoned in your hand (you cant be disarmed when entering a trial, or in any other way)
Also even if the familiar seams strong at lvl 3, remember it does not become stronger with lvls, is always an imp.
This.
The imp is quite fine. It can't challenge anything stronger than a low level goblin. Imps have invisibility in the d&d world, it's their thing along with the poison. Since you forego a lot of power by getting a familiar, it should be able to take out a goblin on its own.
It should have darkvision tho, as written in the rule system.
