Treasure Detector

With the clues THLWS and PERSHENNOG translating to TROPHY OWNER in Welsh and Made in Britain. We are clued we are looking for the of British trophies by identifying the missing object in each image. (https://en.wikipedia.org/wiki/Thirteen_Treasures_of_the_Island_of_Britain)

The number next to each image is the letter to extract from each owners name.

ex. The first image is missing a COAT. This treasure was owned by PADARN BEISRUDD, and we are to extract letter 3 which is D

Treasure	Owner	Number	Extract
COAT	PADARN BEISRUDD	3	D
CROCK AND DISH	RHYGENYDD YSGOLHAIG	5	E
MANTLE (MAN)	ARTHYR YNG NGHERNYW	4	H
SWORD	RHYDDERCH HAEL	3	Y
HALTER	CLYDNO EIDDYN	4	D
CAULDRON	DYRNWCH GAWR	3	R
CHARIOT	MORGAN MWYNFAWR	2	O
HAMPER	GWYDDNO GARANHIR	1	G
MANTLE (WOMAN)	TEGAU EURFRON	2	E
HORN	BRAN GALED O'R GOGLEDD	4	N
KNIFE	LLAWFRODEDD FARCHOG	3	A
WHETSTONE	TUDWAL TUDGLYD	1	T
CHESSBOARD	GWENDDOLEU AP CEIDIO	3	E

This gives the final answer of DEHYDROGENATE