Sandworm - The Termi and Monsen ones, not the Mile on, their attack can do about 150-250 damage to a single party member, and kill them in one shot if their not Gryz, and the biggest threat is their Earthquake attack, it can around 170-230 damage to all characters and possibly kill all but Gryz, and if you dare to attack the Worm again, Gryz could kill it and get lots of XP.
Greneris - Not hard to kill, but their Vol can kill a human with one hit, Doran lowers Agility, Gelun lowers attack power, Rimit puts humans to sleep, Seals can remove Techniques, Force Flash can do about 10-50 damage to all characters.
I will do more later.

