Once it's filled with heat and clicked, it takes a player to the Caves of Torment instead of giving AP boost.

yep I encountered the same today.

I believe it has been so for some time, although I do recall that it had previously granted of some Action Points. Those with greater land loyalty to Necrovion will certainly note of a difference in effect, while those without will find their function rather similar.

I know not which should be the case (evidently, this does not appear to affect most), but I am willing to change this if a consensus were reached as to the appropriate function.

Honestly, I think it should be removed as the boots in the Vale of Oblivion already gives too much Action Points, this will just be another non-functioning baggage and will just confuse and frustrate people with their hard-earned heat. I vote for it to be removed.

This has been resolved.