Ranger Stormwarden ability question

[Otterscrubber]

So at 11th level they get an ability that lets them do their dex bonus in melee damage to 1 adjacent opponent, at 16th level they get an ability to do their dex bonus in lightning damage to 2 adjacent opponents. Guess I'm being greedy but do these attacks stack or does the level 16 one replace the lvl 11 one?

 

[Plane Sailing]

I would have guessed that they stack

 

[ncc4781]

there is no indication that they don't

 

[Otterscrubber]

That was kinda my take on it, glad I wasn't the only one.