Arial Black
Adventurer
And my argument has been steadfastly this, and no other: abusing the initiative mechanic to reinsert a backdoor surprise effect because you, as DM, made the decision to allow a feat that eliminated surprise as a mechanic is bad play.
Since 'surprise' in 5E simply means that you cannot take reactions until after your first turn and cannot move or act during your first turn, then by definition 'immunity to surprise' means that you can use reactions before your first turn and you can move/act during your first turn.
Only telling the party what they can see and not telling them about the things they failed to notice(!) is not 're-inserting backdoor surprise'.
War, battle, armed conflict, whatever you want to call it, is not all about being 'fair'. Combatants use strategy, superior numbers, training, equipment, terrain, everything in their power to be as unfair as possible!
This includes hiding in ambush. How ambushing works is that you hide from the enemy, so that they don't notice you until after they attack. That's how it works!
There is no omniscient power that mystically exists to inform those caught in an ambush of the numbers, type and deployment of ambushers that they have not noticed!
You're damn right it's unfair! It's unfair by design! That's the point of ambush. That's the point of ALL military strategy: to arrange things so that it is not fair but instead so heavily favouring you that you are almost sure to win!
The Alert feat does exactly what it says it does. Nowhere does it state or even suggest that the feat lets you know ANYTHING about those who are about to attack you.
Here's a quote on the same subject in another forum:-
BurgerBeast said:Imagine you are playing the assassin in the woods. You rolled a stealth check to hide and got a 22. You are patiently waiting for Albert, Bert, and Colbert to approach so you can kill them.
Their (A, B, and C's) perception checks are 16, 14, and 6, so the DM rules that you are successfully hidden. He thus decides that at the start of combat, the party will be surprised.
Okay, so at the correct moment, you are going to loose your first arrow. The DM decides that this will initiate combat and therefore everyone should roll initiative. Albert: 21, You: 17, Bert 14, Colbert 9. Albert has the Alert feat.
"You start to loose arrows from your hiding place. Everyone rolls initiative." So now, after having said this, it turns out Albert has beat you on initiative. Since Albert is aware that arrows are being loosed from your general direction, he moves his miniature toward the bushes, and it turns out he moves his miniature right into your square, so the DM rules that he discovers you, and attacks.
Does this seem fair? Because it does not seem fair to me.
You have been hiding and you haven't done anything to give-up your position. The DM has just royally screwed you, in my opinion. And it's not just because you got attacked. It's because the entire handling of the situation makes no sense.
Albert cannot conceivably have any idea that anything is up until you do something. You cannot blow your cover or loose an arrow, and it would be unfair for the DM to just force this onto the situation when it makes no sense.
The Feat means you are not surprised, it does not give you any further mechanical advantages. It does not automatically allow you to know where the enemy is, or what they are doing.