I'm a new DM and I have a level 6 ranger in my party. In our game, we came across 4 closely packed enemies in a 1×4 line. The ranger attacked twice with her short-sword, and twice with her crossbow. She has an Extra Attack, Horde Breaker (class feat), and Crossbow Expert.

  • Action: attack knight #2 with crossbow
  • Extra Attack: moved in and hit knight #1 with short-sword
  • Crossbow Expert: hit knight #4 with crossbow (because she hit knight #2 with short-sword)
  • Horde Breaker: short-sword attack against knight #3 who was within 5 feet of knight #2 who was original target.

She also has the Mobile feat, so didn't provoke any opportunity attacks from the enemies as she moved, attacked, and then moved away. I should also note that in our game I edited the Mobile feat to include any attack (and not just melee) to make it interesting for caster classes to take, which I acknowledge makes it an incredibly strong feat.

After the game, one of the other players started saying that she couldn't do what she did, saying that she can invoke either the Mobile feat or the Crossbow Expert feat "since a feat is like a bonus action but without the bonus action penalty... you can only use 1 feat per round."

I've never seen anything saying you can only use 1 feat per round... Crossbow Expert expressly says it is a bonus action, but Mobile doesn't say that, it just says any enemy you attack no longer has the chance to get an opportunity attack against you. Am I wrong here?

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    \$\begingroup\$ What kind of crossbow is he using? \$\endgroup\$ – inthemanual May 10 '17 at 4:31
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    \$\begingroup\$ @daze413, I don't think the 4 attacks is in question by the Asker, just the using two feats simultaneously. \$\endgroup\$ – inthemanual May 10 '17 at 5:14
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    \$\begingroup\$ Sorry, the attacks seemed fine to me (it was one action that yielded two attacks via Extra Attack, a bonus action attack, and then a feat action). The point the other player made was that the ranger couldn't use the Crossbow Expert feat AND Mobile feat simultaneously, which made no sense to me. If that were the case, then why bother taking multiple feats that synergize well together? \$\endgroup\$ – Khaostos May 10 '17 at 5:40
  • \$\begingroup\$ @daze413, it's entirely legal. Horde breaker allows an additional attack against an additional foe, extra attack grants two attacks during the attack action, and crossbow expert allows an additional attack as a bonus action. That's four attacks. \$\endgroup\$ – inthemanual May 10 '17 at 5:42
  • \$\begingroup\$ Note that Mobile only stops enemies from making opportunity attacks if you make a melee attack. It's not clear from the question if this sequence depended on targets of the crossbow attacks not making opportunity attacks. \$\endgroup\$ – Marq May 10 '17 at 8:07

Feats can be used simultaneously

The only requirement to use a feat is that you meet any prerequisite specified in the feat. No feats that have been released thus far have a requirement that "no other feat has been used this turn," so there's nothing preventing you from using both.

Mobile allows you to not provoke opportunity attacks from creatures you've attacked that round, and Crossbow Expert allows you to make a Bonus Action attack with a hand crossbow, if you've made an attack with a one-handed weapon.

What's not legal, as Daze413 pointed out, is that you're using your "free object interaction" more than once in a round, in order to switch between weapons, or to drop your shortsword and pick it back up multiple times. You cannot dual-wield in this situation, because crossbows need a free hand to be reloaded. If they were made in consecutive order, (sword, sword, crossbow, crossbow) it would be fine, however.

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    \$\begingroup\$ I wouldn't even go so far as to say you "use" a Feat as much as it grants you benefits and abilities, depending on what it says. \$\endgroup\$ – Javelin May 10 '17 at 7:03
  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – doppelgreener May 10 '17 at 10:55

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