Does a polymorphed creature remember who his friends are?

The polymorph spell states, in part:

The target’s game statistics, including mental ability scores, are replaced by the statistics of the chosen beast. It retains its alignment and personality.

Does retaining its personality suffice to let it remember who its allies are? Even if transformed into something stupid like a T-rex? What does it even mean for a beast with Int 2 to have someone’s “personality”?

Can a Barbarian stay in rage while polymorphed? [duplicate]

If a raging Barbarian gets polymorphed into a Tyrannosaurus Rex or a Mammoth or something, to give it more hp, does the rage drop? Polymorph says:

The creature is limited in the Actions it can perform by the Nature of its new form, and it can’t speak, cast Spells, or take any other action that requires hands or Speech.

The Barbarian has already taken the rage bonus action. Rage says the following:

Your rage lasts for 1 minute. It ends early if you are knocked unconscious or if your turn ends and you haven’t attacked a hostile creature since your last turn or taken damage since then. You can also end your rage on your turn as a bonus action.

This says nothing about the rage ending if you change shape. So would this work?

Does flying while polymorphed into a flying creature count as flying by magical means for the purposes of blizzards?

Icewind Dale is a nasty place, where blizzards frequently turn the frozen wastes into an untraversable nightmare. One of the rules for blizzards included in Icewind Dale: Rime of the Frostmaiden makes flying nearly impossible:

The wind extinguishes open flames, disperses fog, erases tracks in the snow, and makes flying by nonmagical means nearly impossible. A creature falls at the end of its turn if it is flying by nonmagical means and can’t hover.

Suppose I use polymorph to change into a giant eagle. Does flying as this giant eagle count as flying by magical means?

Help! My PCs polymorphed my boss enemy! What do I do?

Our Druid has recently gotten access to the polymorph spell and has started polymorphing the opponents I so lovingly crafted for our (well, mostly my) enjoyment. (So far, he has been turning them into rabbits, not yet killer whales.)

Now, the canonical response to a polymorph is to reduce the polymorphed creature to 0 HPs, upon which it will transform back. Or to attempt to break the spellcaster’s concentration.

However, polymorph is a 4th level spell, not a cantrip. It does not seem all that likely the target’s allies know the spell, can connect the dots when their friend suddenly turns into a bunny, and start to attack the bunny, or the spellcaster. It seems more likely that they will just blink upon seeing their friend transformed into a bunny, shrug, write him off, and continue battling the PCs as before. Which would essentially take the target out of the fight.

I have been thinking about allowing the target’s allies an Arcana check each, against some reasonable DC (e.g., 14, which is 10 plus the spell level of polymorph). On a success, they recall hearing about the Polymorph spell and about the two possible remedies. On a failure, they don’t. In which case the target will remain polymorphed, until it gets hit by a stray fireball or some such. I might even allow the target itself an Arcana check, and on a success, it will try reducing its own HPs. Well, this might at least make for some fun.

It looks to me like polymorph might be a bit overpowered against opponents whose allies only consist of non-spellcasters, because they will likely not know what steps to take to break the effect. Is there a better way to role-play what happens to a polymorphed enemy?

Would a polymorphed undead retain any diseases when it reverts back to normal form

Specifically, if I cast a heightened polymorph a lich, turning it into a sheep or caterpillar or something then cast contagion on it (5th level cleric spell that gives the target a disease of the casters choosing after it fails 3 CON saves) then revert it back to lich via damage, would it still carry the disease?