As a rogue I'm planning to take Magic Initiate with warlock class.

[...] Your spellcasting ability for these spells depends on the class you chose: Charisma for warlock [...]

  • cantrip 1: Booming blade or Green flame blade
  • cantrip 2: Minor illusion
  • 1st-level spell: Hex

My stats bonuses are: STR : -3 | DEX +6 | INT 0 | WIS +1 | CHA +4 | prof : 4

Questions:

  • Green flame blade :

[...] The second creature takes fire damage equal to your spellcasting modifier. [...]

What is my spellcasting modifier? 0 from INT as rogue or +4 from CHA as warlock?

  • Minor illusion :

[...] If a creature uses its action to examine the sound or image, the creature can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. [...]

What is my spell save DC? 12 (8 + 0 from INT + 4 from prof) or 16 (8 + 4 from CHA + 4 from prof)?

Edit : replaced AGI by DEX, my bad

  • 1
    What is AGI? That term seems out of place. – KorvinStarmast May 15 at 19:46
  • @KorvinStarmast I assume it is "agility" but think he means DEX for "Dexterity". – Slagmoth May 15 at 19:50
  • @Slagmoth Is that word used in different languages than English? I know that D&D is published in multiple languages .... – KorvinStarmast May 15 at 19:52
  • 2
    @Slagmoth: The question would then be how they have a +6 in that stat... It is obviously possible, but seems a bit out of place. – Rubiksmoose May 15 at 19:54
  • 2
    @Muan: How do you have a +6 in Dex? Unless you have a magic item that increases your maximum Dexterity, the maximum score you can raise it to is 20, which would give you a modifier of +5. – V2Blast May 15 at 22:45
up vote 12 down vote accepted

Your spellcasting modifier for those spells you cast using Magic Initiate is Charisma

You quoted the relevant text:

Your spellcasting ability for these spells depends on the class you chose : Charisma for warlock

So your DCs, to hit modifiers, etc. for those spells are all based on your Charisma, so: DC 16.

If you later learn those same cantrips from another source (multiclassing, Arcane Trickster roguish archetype) you can choose which ability score to use, if that second source uses a different ability score for casting. If you have the Arcane Trickster archetype, then your spellcasting ability for your rogue spells is Intelligence.

  • 1
    It is my understanding that your spellcasting ability is always that of the class associated with the Magic Initiate feat. That is to say if you choose "Magic Initiate [Cleric]" and select "Detect Magic," the ability is always WIS when using the spell (s) gained from the feat regardless of your ability to cast the same spell with another class. Your answer leads me to believe otherwise. (Obviously this was just an example of a spell on multiple class lists, but the modifier is moot for this spell.) – Mazith May 16 at 2:36
  • @Mazith - correct. If you cast the 1st level spell using the free 1/day that you get from the feat you must use the spellcasting ability specified by the feat. If you learn the spell another way and cast it another way then it would not be limited (because you wouldn't be using the feat). If you learn the cantrip twice it's up to you which ability you use. – Nick Brown May 16 at 13:08

Charisma is your spellcasting ability modifier and is used in the calculation of your spell save DC

As you rightly pointed out, picking Warlock for the Magic Initiate feat means that Charisma is your spellcasting ability modifier for the spells you picked.

So your spellcasting ability being charisma, your spellcasting ability modifier is going to be +4.

A spell's spell save DC is calculated as 8+ Spellcasting ability + proficiency bonus, so in your case it will be 16.

This applies only to the spells you obtained through the Magic Initiate feat, and not to other spells you might have obtained through other means such as the Arcane Trickster class.

Note that if you were to take the Spell Sniper and pick Cleric (for instance) you would use wisdom and not charisma as your spellcasting ability for those new spells.

There is no real limit on the number of spellcasting abilities you may have, but it is always determined by the feature which granted you the spell.

Note that it is possible to receive access to a single spell from several sources, each with their own spellcasting ability.

  • You can't take a feat more than once, but your logic is sound. If you rephrase it with regards to Spell Sniper feat it will get the point across – David Coffron May 15 at 20:04
  • You're right I was under the impression it was one of the stackable ones but did not check. – Yannick MG May 15 at 20:06

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