The components needed for Tempest are 

1) Severed Dragon Claw (Aged Earth Dragon, 75%), 
2) Frozen Shard (Ice Golem, 1%), 
3) Displacer Beast Tentacle (Displacer Beast, 10%), 
4) "Twitching" Spider Leg (Giant Spider, 1%). 

Take these to the Gnome Merchant in the Shallow Jungle for Tempest.