This is actually a quite old (2008 if not 2007 I think) problem with the particular  quest:

-- FIXME: The bless armour/weapon rewards were exploitable, as indicated below. I have temporarily removed them.
-- Nov 11 22:37:17 <longir>   we have a major script exploitation problem
-- Nov 11 22:40:17 <longir>   unless 2 armours, one worth 53M shopped and another 6.72M wis+8/grace+240 is no concern
-- Nov 11 22:45:02 <Anchakor>   woohoo, lucky we the wipe is at hand
-- Nov 11 22:45:25 <longir>   yeah
-- Nov 11 22:47:18 <longir>   but if that script isn't fixed, it'll kill the B5 economy before it even gets started
-- Nov 11 23:07:50 <longir>   smacky:  tower of bebeniss quest seriously being exploited, warning that further exploitation is bannable has been issued
-- Nov 12 00:44:38 <smacky>   so tob quest creates mega armour?
-- Nov 12 00:55:58 <smacky>   ah i see what is happening. people are doing the quest, getting their armour blessed, give it to an alt, who does the quest, gets the armour reblessed, etc. each time it doubles in value and loses quarter of its weight, and a few more bits. you can do this with weapons too, btw
-- Nov 12 00:57:02 <smacky>   so a marker that the armour/weapon has been blessed once is needed
-- Nov 12 00:57:19 <smacky>   same sort of problem as with gh smith
-- Nov 12 00:59:32 <smacky>   we need a consistent way to do this for all 'upgrades'. which is one of the problems i was getting at when someone asked about such a system on the forum
-- Nov 12 01:00:08 <smacky>   for now i think ill just comment out those options in the script

Unfortunately noone has shown enough interest to code a non-exploitable system and the scripts author never fixed it with an alternative. So currently there is no reward for that quest.

I'm not too sure on what's this idea is like... but how about adding a small hidden room behind the altar, where the axes are maybe kept in a one-drop chest. *enough so that a player can kill the boss with them.*

That way, you won't have to rely on the possible economy destroying exploit.  And more on the one-drop system which is more stable.  At least until you have a viable solution to the problem.