Ok very sketchy but any help would be nice.

I remember a group of men I think wearing exoskeletons each with different equipment. One with a harpoon I'm sure. There were some big monsters I remember. One I think was all green slime type. One was a big skeleton of some kind who could lock people inside his chest.

Anything?

You jogged my memory with the bit about the chest thing. I think that what you are looking for in the inhumanoids. But I'm not positive.

Sounds a bit like 'centurions' with the exskeletons with different abilities. 1 underwater, 1 could fly, the other a bike. Not sure about the monsters though.

Its called inhumanoids