As far as I know, they do also seeing as I have thorns 3 and unb 3 on my max set on everything and it has never hit someone in prot iv back for more than 1 heart I don't really know if it would stack.

 

The fire protection is very over powered. Also, fire protection stacks perfectly and feather falling stacks slightly, although it is capped after only 2 pieces of feather falling IV. I have no idea about respiration 3 as it is not listed anywhere and aqua affinity doesn't stack you can only break as much as on land, no quicker.

 

I'm not totally impressed with the "unobtainables" in the star shop. I purchased the eff5 sword for 1000 stars thinking it would be more powerful on melons than it actually is. In the end I've spent the equivalent of $250k on a sword that earns less per hour on melons than an eff5 axe earns on pumpkins (without fly). An eff5 axe sells for about $8-$12k.

 

Yeah, the unobtainables should be eff 6 or 7. I don't know what the point of buying an eff 5, st pick or axe is since they are actually obtainable. Only the sword is unobtainable.

 

Except anything above eff V can't exist.

 

Actually, I've seen higher efficiency stuff and higher fortune stuff. You just can't make them, even in creative mode. You have to have a mod and set the efficiency level. However, it is possible that they plugged this, though I doubt it.