The Bombinomicon

The Bombinomicon was once the personal spellbook of a legendary wizard, containing years of forbidden research, powerful spells, and magical knowledge gathered throughout the wizard's lifetime.

When its creator died, the book remained.

Decades became centuries. The magic stored within its pages continued to accumulate until the book eventually developed a consciousness of its own. Its cover formed a strange, expressive face, capable of moving and speaking despite having no mouth.

The Bombinomicon's voice does not come from the book itself. It speaks directly into the minds of those it chooses.

It is intelligent, curious, greedy for magical knowledge, and particularly fond of destructive magic. It has its own opinions, remembers things its original owner knew, and is perfectly capable of arguing with its wielder.

Now, it has chosen you as its wielder.

Whether it considers you its student, servant, friend, or merely someone useful enough to carry it around is something you may have to figure out yourself.

Bombinomicon Spells

You learn the following spells when you reach the corresponding Warlock level. These spells count as Warlock spells for you and don't count against the number of Warlock spells you know.

Warlock Level	Spells
3rd	Shield, Chromatic Orb
5th	Shatter, Counterspell
7th	Fireball, Fire Shield
9th	Wall of Force, Cone of Cold

Explosive Pages

Explosive Pages

When you hit a creature with an attack roll, you can burn a page of the Bombinomicon and expend one use of this feature. The Bombinomicon immediately heightens the spell or attack with its own magic, causing an explosive magical effect.

You then make a spell attack roll against another creature you can see within 30 feet of the original target.

On a hit, the second creature takes 1d10 Force damage.

You can use this feature the same amount of your proficiency bonus, and you regain all expended uses when you finish a Long Rest.

The number of uses per round increases as you gain Warlock levels:

Warlock Level	Uses
3rd	1
6th	2
10th	3

 

You can also burn a page of the Bombinomicon to replace one of your Pact Magic spell slots.

As a Bonus Action, you can burn a page to regain one expended Pact Magic spell slot.

Once you regain a Pact Magic spell slot this way, you can't do so again until you finish a Long Rest.

You regain all burned pages when you finish a Long Rest.

Spell Study

When a creature you can see within 60 feet of you casts a spell, you can use your Reaction to have the Bombinomicon attempt to learn it.

The Bombinomicon consumes 50 GP worth of gold as it studies the spell. You then make an Intelligence (Arcana) check with a DC equal to 13 + your Proficiency Bonus + the spell's level.

On a success, the Bombinomicon learns the spell. The spell counts as a Warlock spell for you, and you can cast it normally.

The Bombinomicon remembers the spell for 24 hours, after which it forgets it.

On a failed check, the Bombinomicon still consumes the gold but fails to learn the spell.

In addition if you witnessed a creature cast a spell within the last 24 hours, you can spend 10 minutes studying the magical traces left behind by that spell.

You must still provide 50 GP worth of gold for the Bombinomicon to consume and make the same Intelligence (Arcana) check.

Protective Spell

When you fail a saving throw, you can use your Reaction to cause the Bombinomicon to intervene. You succeed on the saving throw instead.

Once you use this feature, you can't use it again until you finish a Short or Long Rest.

Death-Plosion

When you are reduced to 0 Hit Points, the Bombinomicon immediately casts Fireball centered on the space where you were reduced to 0 Hit Points.

The Fireball is cast at 3rd level, requires no spell slot, and you are unaffected by the spell.

Roll the Fireball's damage normally. You then regain a number of Hit Points equal to the damage rolled and remain conscious.

Once you use this feature, you can't use it again until you finish a Long Rest.