Some friends and I are playing a level-20 battle royale, so rules are very important.
I was wondering if the creature's new form retains their feats when using the shapechange spell (specifically Polearm Master and War Caster).
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The shapechange spell description says:
You retain the benefit of any features from your class, race, or other source and can use them, provided that your new form is physically capable of doing so. You can't use any special senses you have (for example, darkvision) unless your new form also has that sense.
This includes all feats, though to utilise them your new form must be physically capable of doing so (i.e. you must be able to wield a glaive, halberd, etc. for Polearm Master, and must have a spellcasting ability to use War Caster).
For a full explanation, see: Do any feats carry over when in Wild Shape?