"While you are wielding a glaive, halberd, pike, quarterstaff, or spear, other creatures provoke an opportunity attack from you when they enter the reach you have with that weapon."
I'd say yes. I'd say it's outside your reach around the corner since your weapon can't reach around corners. When they come around the corner, they're reachable by your weapon, and so enter reach then.
If the DM is a stickler for the strict mechanics (as opposed to the spirit of the law that my first response goes with), it doesn't say anything about being able to see them. Therefore technically, while the reach is at 10ft, the opportunity attack is also triggered at 10ft regardless of the corner.
Personally, Id go with option 1. Entering reach is the first opportunity the character has to react - ie, as the enemy rounds the corner, the player gets their attack of opportunity.
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RAW is not particularly clear, nor does SAC address the issue. There's a Crawford tweet that implies an answer of yes (that's about moving out of reach, but the same should apply when moving in). There's also the problem that at the moment they enter your threatened area they have 3/4 cover, so you may be dealing with +5 AC.
We play it the other way. A polearm master holds their polearm at the ready to defend their "perimeter" at 10 feet. If you somehow get inside that perimeter - whether by coming around a corner or stepping through a wall of sand or otherwise being out of sight as they pass the edge of reach, then you slip past their defenses.
I think in a case where RAW is ambiguous, you do what's best for the game. In this case, I'm encouraging smart tactics for both the defender (positioning themselves in a way that eliminates vulnerability) and the attacker (exploiting these chinks in the armor), and slightly nerfing an arguably overpowered feat. Besides, when you're wielding a 10 foot gaive you shouldn't be able to react in a cramped hallway as well as you could out in the open.
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My actual opinion, as opposed to commenting on RAW, is that your reach does extend underground and through barriers, it's just that they have total concealment (so your reaction does not trigger) and full cover (so even if it did trigger, it would automatically fail).
Consider this: someone approaches through a darkness spell, steps out already inside your reach, and attacks. He clearly entered your reach while within the darkness, and therefore (unless you have blindsight) you cannot make an opportunity attack. When he leaves the darkness, sure, he's visible, but he doesn't enter your reach and therefore cannot trigger.
If a creature is around a corner and out of site but 10 ft away then steps out into my vision do I get a reaction attack?
"While you are wielding a glaive, halberd, pike, quarterstaff, or spear, other creatures provoke an opportunity attack from you when they enter the reach you have with that weapon."
I'd say yes. I'd say it's outside your reach around the corner since your weapon can't reach around corners. When they come around the corner, they're reachable by your weapon, and so enter reach then.
If the DM is a stickler for the strict mechanics (as opposed to the spirit of the law that my first response goes with), it doesn't say anything about being able to see them. Therefore technically, while the reach is at 10ft, the opportunity attack is also triggered at 10ft regardless of the corner.
Personally, Id go with option 1. Entering reach is the first opportunity the character has to react - ie, as the enemy rounds the corner, the player gets their attack of opportunity.
If you're not willing or able to to discuss in good faith, then don't be surprised if I don't respond, there are better things in life for me to do than humour you. This signature is that response.
RAW is not particularly clear, nor does SAC address the issue. There's a Crawford tweet that implies an answer of yes (that's about moving out of reach, but the same should apply when moving in). There's also the problem that at the moment they enter your threatened area they have 3/4 cover, so you may be dealing with +5 AC.
We play it the other way. A polearm master holds their polearm at the ready to defend their "perimeter" at 10 feet. If you somehow get inside that perimeter - whether by coming around a corner or stepping through a wall of sand or otherwise being out of sight as they pass the edge of reach, then you slip past their defenses.
I think in a case where RAW is ambiguous, you do what's best for the game. In this case, I'm encouraging smart tactics for both the defender (positioning themselves in a way that eliminates vulnerability) and the attacker (exploiting these chinks in the armor), and slightly nerfing an arguably overpowered feat. Besides, when you're wielding a 10 foot gaive you shouldn't be able to react in a cramped hallway as well as you could out in the open.
My homebrew subclasses (full list here)
(Artificer) Swordmage | Glasswright | (Barbarian) Path of the Savage Embrace
(Bard) College of Dance | (Fighter) Warlord | Cannoneer
(Monk) Way of the Elements | (Ranger) Blade Dancer
(Rogue) DaggerMaster | Inquisitor | (Sorcerer) Riftwalker | Spellfist
(Warlock) The Swarm
That's a fair point.
If you're not willing or able to to discuss in good faith, then don't be surprised if I don't respond, there are better things in life for me to do than humour you. This signature is that response.
thanks those are all great points.
My actual opinion, as opposed to commenting on RAW, is that your reach does extend underground and through barriers, it's just that they have total concealment (so your reaction does not trigger) and full cover (so even if it did trigger, it would automatically fail).
Consider this: someone approaches through a darkness spell, steps out already inside your reach, and attacks. He clearly entered your reach while within the darkness, and therefore (unless you have blindsight) you cannot make an opportunity attack. When he leaves the darkness, sure, he's visible, but he doesn't enter your reach and therefore cannot trigger.