After the island zone they go to the volcano zone where they meet BlueMeramon and find out about Dorulumon's past, while there BlueMeramon sacraficed himself to return a debt to Dorulumon and his dying wish was for Dorulumon to join Xros Heart. The ruler of the Zone is AncientVolcanomon and stuff, they meet Tactimon one of the Baruga Army Head Generals.
After that they go to the Lake Zone where Taiki saves Knightmon from dying and then they are listed to help defend the castle from the Baruga Army. Khiria is also there and this is the first time we see MetalGreymon, during a fight Taiki sees through the army's plan and confront's IceDevimon until Ba'almon attacks, Taiki succeds in driving back the Baruga Army. Taiki collapses because he overworked himself and Zenji The enemy here is IceDevimon but Lilithmon shows up when he doesn't get the Code Crown fast enough, so she unfreezed Daipenmon, kinda poesseses Akari to steal the code crown for her and completely freezes the lake and most of the defending Digimon. Taiki breaks her out of Lilithmon's control by saying she is needed and then DigiXroses Shoutmon X4K (Shoutmon, Ballistamon, Dorulumon, Starmon, Knightmon and several Pawnchessmon), and defeats Lilithmon. Knightmon, Pawnchessmon and the princess (?) Persiamon join Xros Heart.
Next is the Sand Zone where Blastmon is collect Treasure to eat, Taiki get's trapped by a skullscorpiomon and ends up falling on top of Blastmon only to be saved by Revolomon (Deputymon) who shows them where the treasure is. Taiki has to fight Pharaohmon but once he realises that Rovolomon and Pharoahmon are protectors of the code crown they give it to him along with some digimemories. Nene and Kiriha ally and are fighting Blastmon after Taiki uses the Holyangemon digimemory to warp everyone out of the pyramid. Blastmon retreats, then Ba'almon attacks and Taiki falls down a cliff along with a statue. Unknowingly Taiki puts his hand up and the goddess of the statue makes him one of her warrior's. Ba'almon then stops fighting him and tells that the sand zone used to be a very powerful zone, until a tradegic event happen which killed almost every inhabitant. Meanwhile the rest of Xros Heart is looking for Taiki when the seem to be put under a spell and start attacking Akari and Zenjirou. Taiki eventually makes it back with Ba'almon's help and Ba'almon reveals that he was a survivor of the Sand Zone people and was never accepted as a warrior. Ba'almon was later the cause of the slaughter of the Sand Zone's warriors because of one of Lilithmon's subordinates Mind Control and only joined the Baruga Army for revenge. He kills the Ebemon, only to be attacked by Lilithmon herself. Taiki then finds out about a way to heal Ba'almon from Pharohmon and attemps to heal him while the rest of Xros Heart attempt to hold back the Bagura Army without Digixrossing. Half way through the ritual Ba'almon stops it so Taiki can help Xros Heart. Lilithmon had summoned her Mugendramon (Machinedramon) and feeds him the data of an army of SkullScoripomon until it becomes HiMugendramon. Taiki digixroses X4K and fails to beat HiMugandramon. X4K is caught by HiMugendramon and was fire at from point blank range only to be saved by Ba'almon. As Ba'almon dies the Goddess finally accepts him as a warrior and he is reborn as Beelzebumon (Beelzemon) and together with X4K defeat HiMugandramon.
Next is the Heaven Zone and I can't be bothered anymore just look it up on Digimon Wikia from here.
https://digimon.wikia.com/wiki/Heaven_Zone,_The_Snare_of_Paradise!