I am playing a arcanist and I am considering taking the exploit spell tinkerer.
I am only interested in the increase duration effect, not the reduced duration for the purposes of this question.
I need to know how it works with the metamagic feat extend spell?
The way I see it there are 3 possibilities
- They do not stack, any given spell can only be increased by one of the effects and not both.
- They stack but are separate. The spell's duration becomes 250%.
- They stack together. The spells duration becomes 300%.