The magma swords were twin blades carried by Tahu Nuva. He could channel his fire power through them or cross them in front of himself to block attacks.
Tahu Nuva's magma swords could be joined together to form a lava board that carried him swiftly over the magma flows.
Tahu Nuva's tools were two magma swords that could channel his power; they could also be joined together to form a lava board for surfing on molten magma.
Tahu Nuva could split his lava board, which he used to surf on lava incredibly fast, into twin magma swords. Tahu could easily plunge these swords into a solid rock wall and even use them for climbing.