Twice Proficiency allows you to apply double proficiency to a skill or tool under a specific situation, even if you are not already proficient in that skill or tool. Expertise allows you to double your proficiency bonus for a skill in which you are already proficient.
Does blessing of knowledge stack with expertise?
To answer your question: no.
Does Artificers lore stack with expertise?
The wording you’ve highlighted in bold for Artificer’s Lore is just ensuring that the double proficiency bonus doesn’t stack with any other proficiency (i.e. you don’t get triple your proficiency bonus if you were already proficient).
What happens if you gain proficiency twice?
38; PHB, p. 126): If a character would gain the same proficiency from two different sources, he or she can choose a different proficiency of the same kind (skill or tool) instead.
When do you get the blessings of knowledge?
Blessings of Knowledge. At 1st level, you learn two languages of your choice. You also become proficient in your choice of two of the following skills: Arcana, History, Nature, or Religion. Your proficiency bonus is doubled for any ability check you make that uses either of those skills.
When do you get double proficiency in RuneScape?
Your proficiency bonus is doubled for any ability check you make that uses either of those skills. My player chose two of the skills but had the other two from elsewhere and thus noted double proficiency in all four. I’m pretty certain that double proficiency is only gained on the chosen two skills, because
Can a proficiency bonus be multiplied more than once?
If a circumstance suggests that your proficiency bonus applies more than once to the same roll or that it should be multiplied more than once, you nevertheless add it only once, multiply it only once, and halve it only once. – D&D Basic Rules V0.1 Chapter 1, P. 7
How many Proficiencies do you have at 1st level?
Expertise At 1st level, choose two of your skill proficiencies, or one of your skill proficiencies and your proficiency with thieves’ tools. Your proficiency bonus is doubled for any ability check you make that uses either of the chosen proficiencies.
