Okay let's chat about opportunity attacks in D&D 5e. You know that moment when your rogue tries to dart away from an ogre and WHAM - gets clobbered? That's an opportunity attack happening. I've seen so many players mess this up at the table, including myself early on. Like that time my wizard thought casting a spell next to a bugbear was safe... spoiler: it wasn't.
What Exactly Triggers an Opportunity Attack?
Here's the meat of it: when someone leaves an enemy's reach without disengaging, they get whacked. But man, players always forget what "leaving reach" really means.
Movement That'll Get You Hit
Picture this: you're in a 5-foot square, and the orc is right beside you. If you move to any adjacent square not within the orc's reach anymore? That's provoking. But if you circle around them staying within their reach? No attack. Weird but true.
Pro Tip: Diagonal moves count too! That grid isn't safe just because it's kitty-corner.
What Doesn't Trigger Attacks
This is where folks get confused:
- Standing up from prone right next to an enemy? Not provoking.
- Casting a spell? Only if you move away.
- Ranged attacks? Nope.
Last session, our bard thought drinking a potion would trigger it. Had to explain that's not how opportunity attack 5e rules work.
| Action | Triggers OA? | Why |
|---|---|---|
| Moving out of enemy reach | YES | Core triggering condition |
| Teleporting away (Misty Step) | NO | Not using movement |
| Being shoved out of reach | NO | Forced movement |
| Withdrawing without Disengage | YES | Voluntary movement |
Making That Reaction Count
Every DM handles reactions differently. Some forget them entirely, others are ruthless. Here's what you need to know.
Your One Reaction Per Round
This is huge. That fighter with Sentinel feat? They can only make one opportunity attack per round. I've seen players panic thinking they'll get swarmed. Nope, one reaction resets at the start of your turn.
Real table example: Our paladin took War Caster feat but kept forgetting he couldn't cast both Shield and make an opportunity attack in the same round. Cost him two healing potions before it clicked.
How Attack Rolls Work
It's a standard melee attack roll using whatever weapon you have ready. But here's what newbies miss:
- No bonus action attacks (like two-weapon fighting)
- No special features unless specified (like Sneak Attack DOES work if conditions are met)
Honestly, I think the rules should clarify two-weapon fighting better. It's caused arguments at three different tables I've played at.
Beating the System: Avoiding Opportunity Attacks
Want to avoid taking damage? Here's your toolkit.
The Disengage Action
Your safest bet. Use your action to Disengage and you can prance away freely. Rogues and Monks get this as a bonus action - makes them slippery little devils.
But here's a dirty secret: Disengage doesn't protect your friends. If you move past three enemies to safety, the guy behind you still gets smacked. Saw that wipe a whole party once.
Creative Alternatives
Why waste your action when you can:
- Shove: Shove the enemy 5 feet away first. Now you can walk freely.
- Misty Step: My personal favorite. Bonus action teleport with no OA.
- Invisibility/Darkness: If they can't see you, no reaction.
Our sorcerer loves combining Shocking Grasp (which prevents reactions) with Misty Step. Show-off move, but effective.
| Method | Resource Cost | Effectiveness |
|---|---|---|
| Disengage Action | Your main action | ★★★★★ |
| Rogue/Monk Disengage | Bonus action | ★★★★★ |
| Shocking Grasp | Spell slot/cantrip | ★★★☆☆ (only 1 target) |
| Shove Action | Main action + STR check | ★★☆☆☆ (risky) |
Feats That Change Everything
Feats transform opportunity attacks from nuisance to battlefield control.
Sentinel: The Game Changer
This feat is brutal:
- Hits stop enemy movement dead
- Ignore Disengage actions
- Punish enemies attacking your friends
Our tank took Sentinel and suddenly goblins couldn't touch our squishies. DM had to start using ranged attackers more.
Downside? Requires STR build and good positioning. Not great for backliners.
Polearm Master + Sentinel Combo
This combo is filthy good:
- Polearm Master lets you attack when enemies enter reach (10ft)
- Sentinel stops them in their tracks
Now they're stuck 10 feet away, can't reach you. Saw a bugbear chief rage-quit (almost literally) against this setup.
Mage Slayer for Caster Hunting
Perfect against enemy wizards:
- Attack when they cast spells near you
- Give them disadvantage on concentration saves
Shut down a lich's Power Word Kill once with this. Best moment of my gaming career.
Class Features That Rock With Opportunity Attacks
Some classes turn reactions into art forms.
Cavalier Fighter's Hold the Line
Level 10 feature that's often overlooked:
- Make opportunity attacks against anyone moving within your reach
- Hit reduces their speed to ZERO
Basically Sentinel feat but better. Why isn't this talked about more?
War Wizard's Tactical Wit
Not directly about opportunity attacks, but +INT to initiative means you set up control spells before enemies move. That's half the battle right there.
Advanced Tactics for Players and DMs
Let's get into the juicy stuff.
For Players: Baiting Attacks
Sometimes you want to provoke:
- Barbarians with high AC/HP can soak hits so friends escape
- Temp HP buffers like Abjuration Wizards laugh at opportunity attacks
- Attack of Opportunity means they used their reaction - now casters are safe
I once played a Hill Dwarf Life Cleric who'd intentionally provoke to trigger Sentinel at Death's Door. Worked until that critical hit...
For DMs: Monster Tactics
Smart monsters use opportunity attacks too:
- Zombies grapple then let friends attack fleeing PCs
- Hobgoblins form shield walls that punish movement
- Dragons use legendary actions to move and provoke strategically
My favorite trick? Have one enemy Disengage to bait PCs into chasing, leading them past hidden allies. Classic ambush setup.
Common Screw-Ups I've Seen
After DMing for 8 years, these mistakes keep happening:
Reaction Confusion
Opportunity attacks use your reaction. You only get one per round! I've had players argue they should get multiple because "it's logical". Not how 5e works, folks.
Forced Movement Myths
Thunderwave doesn't provoke opportunity attacks when it pushes enemies away. But I've seen DMs allow it because "it looks cool". Consistency matters!
Rule Warning: Opportunity attacks only trigger on voluntary movement using their speed, action, or bonus action. Spells and shoves don't count.
Reach Weapon Misunderstandings
Glaives have 10ft reach. But when an enemy moves from 15ft to 10ft away? No opportunity attack because they're entering your reach, not leaving it. This one trips up veterans.
Optimizing Your Opportunity Attack Build
Want to specialize? Here's how.
Best Race Choices
- Bugbear: Surprise +10ft reach? Gold.
- Wood Elf: Extra speed to position better.
- Hobgoblin: Saving Face helps land crucial OA hits.
Tried a Bugbear Fighter with Polearm Master. Felt dirty controlling 20ft radius.
Must-Have Magic Items
These turn good builds into nightmares:
| Item | Effect | Rarity |
|---|---|---|
| Sentinel Shield | Advantage on initiative and perception | Uncommon |
| Scimitar of Speed | Bonus action attack with +2 weapon | Very Rare |
| Belt of Giant Strength | Higher STR = better hit/damage | Varies |
Our paladin found a Scimitar of Speed at level 9. Suddenly her opportunity attacks became terrifying smite delivery systems.
Opportunity Attack 5e FAQs
Does standing up from prone provoke opportunity attacks?
Nope! This trips up so many players. Standing takes movement but doesn't count as leaving a space. You're safe unless you move away after standing.
Can I make an opportunity attack while grappled?
Absolutely yes, unless the grappler has a special ability preventing it. Your movement is restricted but reactions work fine. Grappled doesn't mean helpless!
Do mounts provoke opportunity attacks when moving?
Oh this is messy. If the mount moves out of an enemy's reach, the mount provokes - not the rider. But if you're controlling the mount, smart enemies might ready actions instead.
Can Rogues use Sneak Attack on opportunity attacks?
100% yes if conditions are met! You just need advantage or an ally within 5ft of the target. Our rogue once did 42 damage on an opportunity attack. Beautiful.
Do opportunity attacks work underwater or flying?
Same rules apply! But underwater combat has half movement, making positioning harder. Flying creatures provoke when leaving reach vertically too. Watch out for those dragons!
Putting It All Together
Mastering opportunity attacks in D&D 5e changes how you play. Suddenly movement isn't just squares - it's risk assessment. I've seen timid players become battlefield commanders once they grasped these concepts.
Remember that time I mentioned my wizard getting wrecked? Yeah, now I always keep Misty Step prepared. Live and learn. Your turn - go control that battlefield!
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