Icy Shield
Your first goal should be to destroy the Ice Barrier around the Missing Link.

One of Lemina's magic tricks will do the trick. Simply let her cast Fire Ring, and the shield is history

Normal Attack
In the library of Missing Link there must be a book about "Kickboxing". Otherwise I cannot explain that this attack will hit a single party member with the accuracy shown here.

Gas Blaster
Jumping across the battlefield and landing on some heads.

This attack is known as Gas Blaster. It always hits an ally zone. So it could be a good idea to split the party before entering the fight.

Frozen Blast
Missing Link indicates this attack by breathing in.

I don't want to imagine whether it is the cold airwave or the smell of Missing Links breath which lets your fiends stay frozen!

Bone Yard
This attack always comes when the ugly ape is opening and closing both hands.

Bones of former victims will fall down on all party members causing some damage.

Take care that it will not be your bones falling in the next round.