# [RPG] How does Spirit Guardians impact available movement for affected creatures

dnd-5emovementspells

For the spell Spirit Guardians, which has a 15' radius,

An affected creature’s speed is halved in the area.

If a creature with normal speed 30 entered the area after moving 15 feet, what is its remaining available movement?

If a creature with normal speed 30/halved speed 15 starts in the area and moves 15 feet to exit the area, what is its remaining movement?

The PHB on page 182 under the heading Difficult Terrain reads:

You move at half speed in difficult terrain—moving 1 foot in difficult terrain costs 2 feet of speed—so you can cover only half the normal distance in a minute, an hour, or a day.

which defines "move at half speed" as "costs 2 feet of speed". How does this connect with the answers below?

PH Page 190 has a section on different speeds that I think would apply:

If you have more than one speed…you can switch back and forth between your speeds during your move. Whenever you switch, subtract the distance you've already moved from the new speed. The result determines how much farther you can move. If the result is 0 ar less, you can't use the new speed during the current move.

If a creature with normal speed 30 entered the area after moving 15 feet, what is its remaining available movement?

You have a speed of 30 and move 15 feet. You then enter the area and you now have a move of 15 feet. Your already-traveled movement is subtracted from your move speed, which is 0 or less, so you can't use the "new" speed.

If a creature with normal speed 30/halved speed 15 starts in the area and moves 15 feet to exit the area, what is its remaining movement?

This is the opposite, you have a speed of 15, and move 15 feet and are out of the area. Your speed is now 30, and you've only used 15 feet, so have 15 more feet available.

## Difficult Terrain

The section you are referring to is under the Speed heading, which states that "[t]he following rules determine how far a character or monster can move in a minute, an hour, or a day." Therefore, those rules wouldn't apply to in-combat movement since that has its own rules.

The rules for in-combat difficult terrain are found PH page 190:

Every foot of movement in difficult terrain costs 1 extra foot. This rule is true even if multiple things in a space count as difficult terrain.

Nothing about halved movement. Hence, I conclude that halved movement, at least in combat (since the spell in question has a duration of 10min, I don't see it being that useful outside of combat), means \$\frac{speed}{2}\$.