in Tales of Phantasia, Dhaos came from Derris-Kharlan seeking a Mana Seed from Aselia's Great Tree due to a Mana Canon having been developed and used in Derris-Kharlan depleting it's mana and causing it's tree to die. At the end i recall that Cress and his party found out about Dhaos true motive and decided that when it was ready, they would give Derris-Kharlan a Seed from their tree.
in Tales of Symphonia Cruxis is based on Derris-Kharlan which was believed to have enough mana on it to revive Sylvarant/Tethe'alla's Great Tree (i don't know the name of their combined world) and in a couple of Skits in Tales of Symphonia: Dawn of the New World Tenebrae points out that the Great Kharlan Tree (Sylvarant/Tethe'alla's original one) is a cut from Derris-Kharlan's and that Mana wasn't naturally apart of the world and thus why Ratatosk was need to regulate it's balance
I am wondering if the Tree mentioned on Derris-Kharlan is it's original tree, or the second one that would come from after the events of Tales of Phantasia?