The Sword can shift into any form of weapon the user desires.
If any of the weapons have any unique abilities like the one from the latest chapter he can use like normal but depending on how powerful the weapon is he will feel exhausted or winded.
It also depends on the magic he has and how much he can control. since he has unlimited magic reserves even the strongest weapon won't kill him but will leave him utterly exhausted.
It is not his power but the power of his weapon all he has to do is pump magic into his weapon and it'll take affect
He is strong himself though with only thing he knows is enhancement magic.
infusIng his body to make him stronger.
And wand magic.
.
Adam was born more than just mortal,
Thanks for the support have a nice day.