[RPG] If your wild shaped form has damage resistance and you revert to your normal form, does your normal form take the halved damage

Any damage carried over will be affected by the new form's traits

This is because resistances, etc. apply whether the damage is dealt or applied in some other way.

If a creature or an object has resistance to a damage type, damage of that type is halved against it. If a creature or an object has vulnerability to a damage type, damage of that type is doubled against it.

To clarify, it specifies that damage is halved without any mention of how the creature receives it. I think you would be hard pressed to say that the carried over damage is not "against it." Also, the damage itself is changed, not just the HP lost, which leads to the entire set of damage being modified before carrying over to the other form.

Here are a few cases to consider (Altered Form has 10 HP, takes 40 damage):

1. Altered Form has resistance, Original Form does not

• Altered Form modifies the damage to 20 causing 10 to carry over.

2. Original Form has resistance, Altered Form does not

• Altered Form takes full damage causing 30 to carry over which is modified to 15.

3. Original Form and Altered Form have resistance

• Altered Form modifies the damage to 20 causing 10 to carry over which is modified to 5.

The stacking of resistances in the 3rd case is due to the wording of the feature. While normally multiple instances of resistance against the same damage type do not stack, the creature only has one instance of resistance at a given time. A plain reading of the polymorph spell gives us that the damage is "carried over" which means "transferred or resulting from a previous situation or context." An answer on a similar feature has clarified that transferred damage is affected by type-based damage modifications. If we take the second portion of the definition of carry over, the word "resulting" give us an entirely new instance of damage as a "result" is a separate consequence than the cause in plain reading.

Sage Advice

This answer is further reinfoced by the official rules clarification document Sage Advice Compendium as of October 2020:

If a creature under the effects of polymorph takesenough fire damage to revert to its true form and that form has fire resistance, does the true form take the full remaining damage or only half due to resistance? When the creature reverts to its true form, any leftover damage is subject to that form’s damage resistances, if any.

The Strength reduction would likely only affect your beast form

Jeremy Crawford has said this regarding maximum hit point reduction (borrowed from this answer to a question about maximum hit point reduction):

Jonathan Longstaff
^@pukunui81
@JeremyECrawford What happens when a wildshaped druid that has had its HP max reduced reverts back to normal? Does the reduction carry over?

Jeremy Crawford
^{@JeremyECrawford}
Wild Shape—a reduction to hp maximum doesn't carry over from your beast form to your true form or vice versa.

Although they are different effects (strength reduction and maximum hit points reduction), the reasoning for one would apply to the other, given that they are both reductions that end on a long rest. However, I cannot find anything published in their Sage Advice publication to confirm JC's ruling.

Taking from the description of Wild Shape (PHB, pg. 67):

While you are transformed, the following rules apply:

• Your game statistics are replaced by the statistics of the beast, but you retain your alignment, personality, and Intelligence, Wisdom, and Charisma scores.

And:

• When you revert to your normal form, you return to the number of hit points you had before you transformed.

That part only discusses hit points reverting back to what you had before, and doesn't explicitly mention your maximum hit points or ability scores returning back to normal, it is only implies by the "While you are transformed" part at the start of this bullet list. Without anything explicit to go on, applying the same reasoning as JC seems consistent with current hit points, at least.