To build up from this similar question, does the warlock's +1 bonus from the Improved Pact Weapon eldritch invocation stack with optional bonuses, i.e. flame tongue when activated does 2d6 extra fire damage.
The relevant text for this:
Improved Pact Weapon:
In addition, the weapon gains a +1 bonus to its attack and damage rolls, unless it is a magic weapon that already has a bonus to those rolls.
While the sword is ablaze, it deals an extra 2d6 fire damage to any target it hits.
There is no dispute between the +1 to hit, so I am confident in this bonus being applied. The issue is instead with the damage.
When the flame tongue is not ablaze, it would do x+1 (where x is the base damage). However, when ablaze, will it do x+2d6+1 damage? Or just x+2d6 damage?