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I'm pretty sure there's no RAW reason why this spell can't be cast on oneself. Is this the case? As an example, could a recovering alcoholic cast geas on themselves to refrain from drinking?

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    \$\begingroup\$ Just FYI: Only quote the parts of the spell that you need to quote. If you don't need to quote the spell there is no need to quote any of it. Experts will have access to the spell to get you an answer. I have removed the quote entirely since it is unnecessary. \$\endgroup\$ – Rubiksmoose Aug 2 '18 at 0:20
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Certainly, but you could also remove it

It has been established that in normal circumstances, you can see yourself. So you are a valid target of this spell.

But it's worth noting that:

You can end the spell early by using an action to dismiss it. (PHB, p. 245)

So this spell would only last as long as you wanted. If you are trying to force yourself to do something, that takes some out of the teeth out of the tactic.

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    \$\begingroup\$ Though the other answer is equally correct, I selected this one because the ability to end the spell early is a good reason to not even bother. Thanks! :) \$\endgroup\$ – Max Leeming Jul 31 '18 at 22:49
  • \$\begingroup\$ I suppose you could cast this spell on yourself multiple times, with the terms of each Geas being, in part, that you take damage if you remove any of the other Geas spells from yourself. But this begs the question of whether or not a single action would remove all the spells at once, which deserves to be its own question. \$\endgroup\$ – Gandalfmeansme Jul 31 '18 at 22:59
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    \$\begingroup\$ Could you do that in a single Geas? "I am bound to do X, and must not remove this spell from myself." While you could still end the spell, it would get to bite you once. I can imagine this being used to enforce oaths, for example. \$\endgroup\$ – Mark Wells Jul 31 '18 at 23:32
  • \$\begingroup\$ No, that wouldn't work. In the absence of text defining specific timing of a trigger and event (like counterspell, which specifies that it takes effect before the targeted spell goes off), a result happens after its trigger finishes. So you'd finish your action ending the spell, and then the spell would try to hurt you but couldn't because it would already have been ended. \$\endgroup\$ – Gandalfmeansme Aug 1 '18 at 0:58
  • \$\begingroup\$ (Support for this rule can be found on DMG, p. 252) \$\endgroup\$ – Gandalfmeansme Aug 1 '18 at 1:09
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You can target yourself

The only requirements are

on a creature that you can see within range

You are a creature, you can see yourself - unless you are blinded, invisible or something like that - and you are within range. You are a valid target.

For reference, Crawford talks about this targetting for other spells.

I don't know about you, but when I look down, I can see myself. Blinding me would definitely change that. #DnD #Optics

Now, how does it affect you? RAW, it does what it says

If the creature can understand you, it must succeed on a Wisdom saving throw or become charmed by you for the duration. While the creature is charmed by you, it takes 5d10 psychic damage each time it acts in a manner directly counter to your instructions, but no more than once each day.

You will, awkwardly, have to roll a saving throw against yourself and be charmed by yourself (which doesn't actually change many things). If the PC tries to drink, he takes 5d10 damage.

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