Also... you can describe the invisibility spell working however you want but mechanically it gives you the Invisible condition which can only be negated in the specific ways you counter or end the spell.. its pretty simple design when you accept it for what it is vs. Preconceived notions.
Alright, you know what? Let’s remove all the preconceived notions. Allow me to present a new homebrew spell: abracadabra.
Abracadabra
level 2 - illusion
Casting Time: Action
Range: Touch
Components: V, S, M (an eyelash in gum arabic)
Duration: Concentration, up to 1 hour
A creature you touch has the Purple condition until the spell ends. The spell ends early immediately after the target makes an attack roll, deals damage, or casts a spell.
Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 2.
And, the accompanying homebrew condition, Purple:
Purple
While you have the Purple condition, you experience the following effects.
Surprise. If you’re Purple when you roll Initiative, you have Advantage on the roll.
Concealed. You aren’t affected by any effect that requires its target to be seen unless the effect’s creator can somehow see you. Any equipment you are wearing or carrying is also concealed.
Attacks Affected. Attack rolls against you have Disadvantage, and your attack rolls have Advantage. If a creature can somehow see you, you don’t gain this benefit against that creature.
Now, can you (or
@Parmandur or
@Selas or whoever else would like to weigh in) tell me, if my character, Charlie, casts the
abracadabra spell on herself while standing within the line of sight of a Goblin Warrior with no source of cover or obscuration, can the Goblin Warrior attack her, and if it does, does it have disadvantage on that attack? If Charlie attacks the Goblin Warrior while she has the Purple condition, does she have advantage on her attack? Can Charlie’s Bard ally target her with the e
nlarge/reduce spell (which I double checked, does require you to be able to see the target) while she has the Purple condition? However you answer these questions, I would appreciate you explaining how you arrived at those answers, based on the text of my homebrew spell and condition.