I got around to testing the shrine weap, comparing it to my 8/8 +1 ashtal wand.. I made the shrine weap +12 and stoned it with a lvl 4 ice prayer stone and 3x lv3 att prayer stones.
Testsubject was a party buffed knight, testskills were life black fire + wretched cold:
Shrine weap
Life black fire: 1343 on average
Wretched cold: 2343 on average
92 weap
Life black fire: 1537 on average
Wretched cold: 2594 on average
So that's alot of difference still. Was thinking the heroic att power would blow away the +1 to all skills, but apparently not. Never mind the stones, 4 ashtals won't make that much of a difference in comparison.
Kind of disappointed, was hoping to set the goal to get one :<
Caster weapon my ass