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Scenario:

A druid ally is in melee range of an enemy berserker and decides to move away, provoking an attack of opportunity from the berserker.

My character has readied an action: Cast Eldritch Blast (with Repelling Blast invocation) on the berserker in question if he attacks the druid.

What I think happens

The druid's movement is interrupted by the attack of opportunity which is in turn interrupted by the readied Eldritch Blast. Assuming the Eldritch Blast hits, I can push the berserker out of melee range of the druid, thereby negating the attack of opportunity.

Is this correct?

Similar situations

What if, rather, the trigger was the druid moving? What if the trigger was the berserker raising his weapon or rearing back in preparation for an attack?

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    \$\begingroup\$ I am assuming this scenario is the warlock wants to protect the druid. So the trigger is "On a signal from the druid" which the druid does before he wants to move. \$\endgroup\$ – SeriousBri Sep 27 '18 at 7:20
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Your Druid Gets Attacked, then the barbarian gets pushed

The trigger for your readied action was:

Cast Eldritch Blast (with Repelling Blast invocation) on the berserker in question if he attacks the druid.

It is stated in the Dungeon Master's Guide (p. 252) that:

If a reaction has no timing specified, or the timing is unclear, the reaction occurs after its trigger finishes, as in the Ready action.

So your readied Eldritch Blast will occur right after the berserker attacks the druid.


What if, rather, the trigger was the druid moving? What if the trigger was the berserker raising his weapon or rearing back in preparation for an attack?

The alternative triggers would not improve matters much. If you specified the trigger was "the berserker raises his weapon to attack", that might be tricky, because the trigger has to be a "percievable circumstance." In combat, everyone always looks like they're just about to attack each other: what if the enemy doesn't "raise" a weapon, but stabs with it? What if they raise a weapon in salute?

If the tirgger was the Druid's movement, that's no good either because the Barbarian will attack before the Druid moves away from his reach (as that's the timing specified in Opportunity Attacks), and you'd Eldritch Blast after the Druid finished moving away from his reach (since it's a Readied action, and happens after its trigger), so the berserker would still attack first.

A relevant question that has been asked before is can I specify a trigger to be "before... occurs"? (Mostly, you can't).

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  • \$\begingroup\$ I knew the wording of the trigger was critical.What if I instead said the trigger was the Druid's movement or the berserker raising his weapon in preparation to make an attack? \$\endgroup\$ – Rykara Sep 27 '18 at 0:47
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    \$\begingroup\$ That might be tricky, because the trigger has to be a "percievable circumstance." In combat, everyone always looks like they're just about to attack each other: what if the enemy doesn't "raise" a weapon, but stabs with it? What if they raise a weapon in salute? A relevant question that has been asked before is Can I specify a trigger to be "before... occurs"? \$\endgroup\$ – Gandalfmeansme Sep 27 '18 at 1:12
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    \$\begingroup\$ As far as the Druid's movement, that's no good either because the Barbarian will attack before the Druid moves away from his reach (as that's the timing specified in Opportunity Attacks), and you'd Eldritch Blast after the Druid finished moving away from his reach (since it's a Readied action, and happens after its trigger), so the berserker would still attack first. \$\endgroup\$ – Gandalfmeansme Sep 27 '18 at 1:14
  • \$\begingroup\$ It might be better to quote the specific rules on the Ready action rather than the general rules on reactions, since the specific rules more clearly state that readied actions must take place after their trigger. \$\endgroup\$ – Kamil Drakari Sep 27 '18 at 15:28

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