# How far does Ice Knife Spread on a large creature

The spell ice knife states:

You create a shard of ice and fling it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 piercing damage. Hit or miss, the shard then explodes. The target and each creature within 5 feet of it must succeed on a Dexterity saving throw or take 2d6 cold damage.

When hitting a medium creature, the area within 5ft of it covers 8 tiles. If you hit a large creature it covers 16 tiles on the same spell. RAW am I reading the spell right, can you damage (potentially) twice as many creatures?

• Sep 28, 2022 at 23:42

## Not exactly

It also affects creatures within 5 feet above and below. So that’s 27 5x5x5 spaces for a medium/small creature (including the creature’s own space - it might have/be a rider) or 64 spaces for large and so on.

• @Exempt-Medic I assume it's because the game is usually handled in 2D as far as mecanics go. Mostly because it's easier and flying enemies are annoying to use on a map. Also, those situations are rare, the most common being a rider that Dale mentions. This makes a 2D map a good enough approximation. A large creature could be comon case for "enemies underneat", seeing as you can occupy the same space as a large creature if my memory is correct. Sep 29, 2022 at 0:52
• @Exempt-Medic because I can’t do maths Sep 29, 2022 at 1:40

## For practical purposes, yes

Ice knife was errataed to not use language about a radius any more1, so it only cares about distance from creature to creature. That means that any creature within five feet of the target creature will be affected, just as the spell says. With a larger creature, you will affect a larger area.

How that translates in play depends on if you play on a square grid or not. If you do, then even though the creature does not fill the entire grid cell, any adjacent square will be in range, as the rules advise you to count that as 5 feet (p. 192 PHB):

To determine the range on a grid between two things — whether creatures or objects — start counting squares from a square adjacent to one of them and stop counting in the space of the other one.

As Dale points out, in the unusual case that you deal with 3-D combat, you will affect a larger volume, and also hit the cubes above and below the target creature2.

If you don't use a grid but still use miniatures, then you measure the distance between the creatures. If you use narrative combat, the DM will determine which creatures are within five feet of the target.

1 There is some discussion if effects that spread in a radius around a target creature (typcially the caster, such as Spirit Guardians around the caster or the effects of a scroll of protection) originate from the overall creature or a point you need to pick. This is not unequivocal, so it will require a DM call (strong majority vote on this site is that it will originate from the overall area the creature occupies). Because ice knife does not use the radius language, it avoids these issues.

2 If the target was Huge, then you would affect an area of 25 tiles or 125 cubes, and if it was Gargantuan, you would affect 36 tiles or 216 cubes.