You cause a creature or an object you can see within range to grow larger or smaller for the duration. Choose either a creature or an object that is neither worn nor carried. If the target is unwilling, it can make a Constitution saving throw. On a success, the spell has no effect.
If the target is a creature, everything it is wearing and carrying changes size with it. Any item dropped by an affected creature returns to normal size at once.
Enlarge. The target's size doubles in all dimensions, and its weight is multiplied by eight. This growth increases its size by one category-- from Medium to Large, for example. If there isn't enough room for the target to double its size, the creature or object attains the maximum possible size in the space available. Until the spell ends, the target also has advantage on Strength checks and Strength saving throws. The target's weapons also grow to match its new size. While these weapons are enlarged, the target's attacks with them deal 1d4 extra damage.
Reduce. The target's size is halved in all dimensions, and its weight is reduced to one-eighth of normal. This reduction decreases its size by one category--from Medium to Small, for example. Until the spell ends, the target also has disadvantage on Strength checks and Strength saving throws. The target's weapons also shrink to match its new size. While these weapons are reduced, the target's attacks with them deal 1d4 less damage (this can't reduce the damage below 1).
* - (a pinch of powdered iron)
Important question: can this spell be used in conjunction with other spells? Such as wall of stone?
What would one need to do to reduce a target to a size MUCH smaller than 1/2 of it's original size?
Probably Homebrew an "at higher levels" section that allowed you to cast this sprin at higher levels to empower / reduce further.
Or you could have several casters using the same spell on one target. So far as I know there is no rule in any book that says "A target cannot be under the effects of the same spell cast by multiple creatures." So if you had 2 people reduce one target than suddenly the target is a quarter their original size and a sixty-fourth their original weight or inversely 4 times as large and 64 times heavier.
If you got 3 casters with Enlarge/reduce suddenly you have a (presumably originally medium) barbarian who is as large as the Tarrasque.
You could go 1 level of rogue for expertise in athletics, maybe pick up the grappler feat, and now you can have a nearly fair WWE match with dnd's very own Godzilla.
EDIT: So unfortunately after some reading of some rules, a target cannot be under the effects of the same spell multiple times, so unfortunately there can be no gargantuan barbarian wrestling match without some breaking of the laws of reality :( (otherwise known as homebrew ;) )
It seems odd that the effect of this spell on damage-dealing when bigger is so much less potent as opposed to the Potion of Giant Size. I get that the potency of the magic in the potion is greater, this is just a 2nd level spell, and you may not get as big with just the spell, but they seem pretty far apart. Some grading of extra damage based on total size would seem to be more accurate.
That's the beauty of Homebrew.
I use it as an enchanted on a ring, but it doesn't last as long, only forf hours, and it only increases the weight by 4, so a 3ft tall 30 lb. Halfling is 6ft tall and 120 lbs instead of 240.
One further caveat, any attack action or spell cast by the wearer cancels the magic.
My question here is, if this isn't the ultimate door/gate opener with reduce. Reduce a door and just kick it away. As there is no limit to object size, you could even win a siege with this by shrinking the giant closed dwarven stone portal by one size, making it just a rock that does not really hinder anyone anymore.
Even better for doors that have traps or are magically warded, because you do not open them anymore bet merely step over or around them...
I guess I would give certain structures some kind of saving throw, especially enchanted doors and gates, but if you just use what is written there, it is a mega powerfull spell.
I would worry that any DM would advise that the door/gate is being "carried" by the wall due to the door hinges.
Valid argument, although I am pretty sure the origin of this rule is that u don’t squish people who carry something heavy. I wonder if this would destroy some dungeon crawling campaigns.
Thanks @Criskornelus
If a gnome is on average 40 pounds. And to reduce yourself brings you to one eighth of that. Could you in theory. Become a flying naked gnome with the use of mage hand? I am asking the real questions here.
I don't see a problem here except they both last 1 minute. I mean, that might just be enough time for what you need but why naked?
It's not concentration, so assumedly so.
because any additional weight wouldnt make it work
This is my favorite comment to date.
Everyone has their kinks.
I agree. Perhaps a home brew of the brute trait (an extra die of damage)?
I have an issue with this spell for larger and stronger characters/creatures. I play regularly with a Goliath and a Minataur, and giving them the boost in size should increas the bonus hit die damage as well. I mean, a living siege weapon that gets additional 1d4 seems kind of weak to me. If anything, large to huge creatures should get at least a 1d6 or a flat boost to damage like with rage (+2 for most levels). Also, characters with high strength scores like barbarians and fighters, shouldn't they hit harder, commensurate to their new size? If i'm wrong, please discuss it with me. If not, this is what I'm doing at my table.
If you use this on a mount and your riding it, do you grow too?
No. Only the target increases a size, not you. of course, you could use hombrew to change that.
RAW says one can not be affected by two spells or effects with the same name. Homebrew says you can do whatever you feel like though :)