No, the warlock’s Pact Magic feature is a completely separate feature from the Mystic Arcanum feature, and each independently describes how you get spells without relying on or referring to the other. Pact Magic says you get another spell known at e.g. 11th level, so you do, period.
Can you change Mystic Arcanum spells?
No. It’s because it isn’t actually a spell slot, it’s a class feature that only lets you use the selected appropriate level warlock spell.
Do Mystic Arcanum require components?
Mystic Arcanum doesn’t explicitly state that you do not need to expend material components to cast the spell, so you do still need them.
Can a Warlock change their mystic Arcanum?
The Warlock can choose any spell he currently knows to cast at the level of Mystic Arcanum that he currently possesses (e.g. Cloud of Daggers, using his 6th level Mystic Arcanum.)
Can a warlock know more than one mystic Arcanum spell?
A spell you choose must be of a level no higher than what’s shown in the table’s Slot Level column for your level. The Slot Level column never increases above “5th”, so a warlock can never know a warlock spell of 6th level or higher. Therefore the Mystic Arcanum spells must be known separately from the warlock’s Pact Magic spells.
Is the Mystic Arcanum the same as Pact magic?
If that reasoning is not convincing, here’s a bit of circumstantial evidence underlining the necessary separation of the two features: Notice that the spells you gain access to with Pact Magic and Mystic Arcanum cannot be the same due to incompatible spell levels!
What does mystic Arcanum do in RuneScape?
The Mystic Arcanum feature, separately, gives you access to a new spell that you can use with the Mystic Arcanum feature.
When does Pact magic take up a spell known slot?
No, the warlock’s Pact Magic feature is a completely separate feature from the Mystic Arcanum feature, and each independently describes how you get spells without relying on or referring to the other. Pact Magic says you get another spell known at e.g. 11th level, so you do, period.
