You can have your Swords and Armor BLESSED in any Temple. There are three types of Blessings:
Bless #1 [ + 05% ] Bless #2 [ + 10% ] Bless #3 [ + 15% ] A Blessed Sword will have a better chance of hitting the opponent. A Blessed Suit of Armor will have a better chance of protecting you against the opponent's attacks. The effect seems to be more pronounced in the case of Armor, so if you need to choose between the two, go for the Armor rather than the sword.
The Cost varies between Temples, and is based on two separate factors, the BASIC FEE of the Temple plus a PERCENTAGE OF THE BASIC PRICE of the Item.
EXAMPLE: TEMPLE OF KILLIAN ( 25 + 75% of Basic Price )
The Basic Price of a Sword of LimsKragma is 1000. At the Temple of Killian a #1 BLESSING can be bought at a cost of:25 + (1000 x 0.75) = 775
Here's a classified table of Blessing Costs.
A table of Basic Prices will be found further below.



Finally, for your convenience, here's a list of all Blessable Items and their Basic Prices:


The above information should enable you to calculate the Blessing Costs for any Item in any Temple.