For the duration, the spell enlarges or reduces a creature or an object you can see within range (see the chosen effect below). A targeted object must be neither worn nor carried. If the target is an unwilling creature, it can make a Constitution saving throw. On a successful save, the spell has no effect.
Everything that a targeted creature is wearing and carrying changes size with it. Any item it drops returns to normal size at once. A thrown weapon or piece of ammunition returns to normal size immediately after it hits or misses a target.
Enlarge. The target’s size increases by one category—from Medium to Large, for example. The target also has Advantage on Strength checks and Strength saving throws. The target’s attacks with its enlarged weapons or Unarmed Strikes deal an extra 1d4 damage on a hit.
Reduce. The target’s size decreases by one category—from Medium to Small, for example. The target also has Disadvantage on Strength checks and Strength saving throws. The target’s attacks with its reduced weapons or Unarmed Strikes deal 1d4 less damage on a hit (this can’t reduce the damage below 1).
* - (a pinch of powdered iron)
no longer affects the weight of the target? That is a bit of a downgrade...
On the plus side, at 1/8th your normal density you'll be able to safely go swimming in full plate armor.
I know the 2014 version didn't do this either, but why would Enlarge (from Medium to Large) not change your Reach with a Weapon?
I know the rules for Melee Attacks state 5ft, but that is because there are no playable Species that are bigger than Medium.
Wouldn't a 'Large' creature typically have a reach of 10ft?
I really wish they had tried to address more clearly how the spell affects objects. I've always found that to be a mess. It's often messy on doors, locks, chests, traps, ships or portions thereof, falling objects, etc. And now, with no adjustment to weight, it's just strange to think about what's really going on.
Still trying to figure out how people would rule placing an enlarged band around the head/neck of a creature and then dropping the spell. Does the creatures head pop? Does the creature start suffocating? Does the band now stay permanently enlarged? Does the band break? Does the whole of reality collapse in on itself? What is the answer???
A reach of 10 feet is more commonly associated to Huge or larger creatures (like giants). Large creatures with a reach of 10 feet is not common.
In the 2014 version, it is indicated that "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". I am not sure why it was removed but it effectively prevented an enlarged creature from getting squeezed, choked or otherwise physically limited upon casting.
Of course, after the casting, the creature has to deal with its new size (in both versions of the spell).
When it says, "A thrown weapon or piece of ammunition returns to normal size immediately after it hits or misses a target", does that mean it deals the increased damage or the damage it would normally do?
I read this as meaning that it would shrink immediately after it does damage or fails to do damage, so it would do the enhanced damage if it hits.
Coolio
Up to the DM. I'd rule the item can't be worn because the spell says "A targeted object must be neither worn nor carried." You could interpret that as meaning it can't be worn at the time of casting, but it's the best indication of how the designers intended the spell to handle all worn items.
Does this have any extra effect on Carrying Capacity?
Overall its determined on Strength Score and having Advantage to checks and Saving Throws does not affect total weight carried or push.
Or should we just take the details from Carrying Capacity rules in PHB where Medium is STR Score x 15, but Large is STR score x30 where Str is not changed just the multiplier?
So a Medium size PC with a Strength score of 15 has a max Carrying Capacity of 225 lbs.
But the same PC Enlarged to Large size now has a max Carrying Capacity of 450 lbs.
Am i doing the math and interpretation right?
Carrying capacity is based on Strength score and Size. This spell doesn't change the target's Strength score, but it does change its Size, so it can change its carrying capacity.
(It wouldn't change the carrying capacity of a Medium creature becoming Small, or vice versa, because they share the same carrying capacity formula.)
Your math is correct.