What happens when your speed changes in middle of your turn?
Here is (a simplified version of) what happened:
I am a human with speed 30. I am prone at the start of my turn and within 15 feet of an enemy with Spirit Guardians active. So my speed is halved due to the spell, so my speed is 15 feet. I stand up, using half (7.5 feet) of my movement. I then use 5 feet of movement to walk out of the spell's effect area, leaving me with 2.5 feet of movement?
Or does my speed now return to its usual 30 feet, of which I've used 12.5 feet of movement so far?
Usually effects will say moving costs extra movement rather than saying they change you're speed. I'd go by that.
Also, for playing on a grid, squares that require extra movement apply when they are being either entered or exited, not both. I can't remember if the RAW makes a preference, I think it is up to DM.
You would have either 5 or 10 feet of movement depending on DM.
The side effect of taking the language too literally instead of what was intended is that the spell that reduces speed lets you move further than you normally could.
The rules for difficult terrain use both "half speed" and "cost 1 additional foot of movement" in different parts of the rules. The devs treat these as meaning the same thing.
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What happens when your speed changes in middle of your turn?
Here is (a simplified version of) what happened:
I am a human with speed 30. I am prone at the start of my turn and within 15 feet of an enemy with Spirit Guardians active. So my speed is halved due to the spell, so my speed is 15 feet. I stand up, using half (7.5 feet) of my movement. I then use 5 feet of movement to walk out of the spell's effect area, leaving me with 2.5 feet of movement?
Or does my speed now return to its usual 30 feet, of which I've used 12.5 feet of movement so far?
Usually effects will say moving costs extra movement rather than saying they change you're speed. I'd go by that.
Also, for playing on a grid, squares that require extra movement apply when they are being either entered or exited, not both. I can't remember if the RAW makes a preference, I think it is up to DM.
You would have either 5 or 10 feet of movement depending on DM.
I agree that's how things like difficult terrain work, which makes the calculation easier.
Spirit Guardians instead cuts your speed in half, so I'm not clear what happens once you leave the affected area.
Well it says, "An affected creature's speed is halved in the area", so once out your speed should be back to normal.
The side effect of taking the language too literally instead of what was intended is that the spell that reduces speed lets you move further than you normally could.
The rules for difficult terrain use both "half speed" and "cost 1 additional foot of movement" in different parts of the rules. The devs treat these as meaning the same thing.