Alatreon is an elder dragon. It knows four elements; Fire, Ice, dragon and thunder. Alatreon is only able to use ice and thunder in flight. Alatreon's weapons are the only purple sharp weapons in Monster hunter tri. The only non-purple sharp weapon is the bowgun. Alatreon is fought in the Sacred Land an area similar to the Battleground in MHFU. Alatreon is also the final online boss in MH Tri.