Interesting stuff.
That is exactly the combo I think I have referred to (with the rear-guard thing). Great if you want to go for "prevent enemies from reaching back row" the combination is wonderful (or prevent getting swarmed). For maximum number of attacks, not so much no.I see a lot of comments that Sentinel and Tunnel Fighter work well together. Meh, not so much, in practice. Tunnel Fighter works to prevent the "Conga Line" issue with the movement rules. But Sentinel stops creatures near you. Stopping creatures near you means the Conga Line doesn't work very well (it leaves fewer spots to occupy for those participating int he Conga Line, and slows their movement due to difficult terrain of their ally's space). Sentinel reduces the number of creatures that can get to you in a Conga Line, which means Tunnel Fighter would be triggered less if you have it. There is some synergy there, but the synergy is not "a whole lot more Opportunity Attacks". Adding Sentinel to the mix reduces the number of Opportunity Attacks you will make with Tunnel Fighter, not the opposite.
I see a lot of comments that Sentinel and Tunnel Fighter work well together. Meh, not so much, in practice.
Awesome, thanks for that. I can see this archetype getting very popular indeed.Just talked to Mearls via Twitter.
"Nice job on the new UA. Might there be any new Invocations to accompany the new Patron?"
"If it proves popular, could get some."
So there's that.
Nothing should provide unlimited AoOs. Not a feat, not a spell, nothing. It opens the door to absurdity that rules lawyers try to force on DMs. Whoever wrote that fighting style didn't think it out too well.
It allows a player with the fighting style to swing far more times than character without that fighting style when a large number of AoOs are allowed.
It also creates problems if they create feats like Polearm Master that allow for AoOs when approaching a player or Sentinel when allowing AoOs for a player that moves away regardless of using Disengage. It will create long-term problems with any feat that allows an AoO for other situations. I watched this crap with Combat Reflexes in Pathfinder with abilities like Come and Get Me where the player was able to swing an absurd number of times. Combat Reflexes that maxed AoOs at a Dex modifier + 1 was bad enough. When the Mythic Adventures book came out allowing for unlimited AoOs, Come and Get Me and some similar abilities can't remember the name of became ridiculous.
Allowing an unlimited AoO abilities opens the door to absurdity. It becomes worse when some game designer forgets and puts in an ability that synergizes with a feat to create ridiculousness. 5E is already far too easy a game. A fighting style like this just makes a DM's ability to challenge more difficult.
On top of that, being able to swing that many times compared to say something with much better reflexes looks stupid in my mind's eye. I
BTW to the above poster(s): AoO's are reactions not bonus actions
You are not allowed more than one reaction, nor bonus action per turn.
the problem is, if we are reading this correctly, Tunnel Fighter sets up a precedent for multiple reactions per turn...breaking the RAW/RAI and opening the door for absurdity.
I'm still pretty OK with Tunnel Fighter, but to me the weird corner case isn't with Sentinel, it's with Polearm Master. TF+PM means if a single foe tries to get past you, you get up to three attacks: free OA for entering reach, TF reaction for moving more than 5 feet within reach, and another free OA for leaving reach. That's... a lot, potentially even at level 1 with variant human.
The reason I'm still pretty OK with it is that whether this actually ever happens is entirely under the control of the DM. That's a pretty determined creature to keep ignoring the Fighter. As a DM, if I have a player that wants that badly to play an aggro-drawing tank, I don't see why it hurts to oblige him/her. The opportunity cost is not insignificant.