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How to have unlimited arms in DnD
This is a funny but slightly broken combo that you could ( and probably should ) argue doesn't work but the rules don't say it doesn't work so take from that why you will.
Play as a Plasmoid armourer artificer
As an armourer artificer your arcane armour expands to cover your whole body and replaces missing limbs
As a Plasmoid you can use your shape self action to retract your limbs and become a and I quote "limbless blob" now your armour will replace your now missing arms with magic armour arms.
Now use shape self to grow new arms. Because the armour grows to cover your whole body it grows a new pair of arms around yours
Now when you retract them again those arms are now missing but the armour's arms remain and replace them 😎
Which means you repeat the process of using shape self and gaining two more arms each time until you have enough for any purpose
For example with six arms you can duel wield two handed weapons, hold a Shield and leave a hand free for spellcasting
Or you could have eight arms and use them to grapple four creatures at once
The possibilities are pretty much endless