Daystar

I have daystar; very useful vs undead. However, I cannot get it to create a Sunray. When I click on that icon, I just run forward to perform a standard melee attack. Is this a bug, or are there some conditions that have to be met first?
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Sunray is indeed a party-friendly spell. None of the effects will hit anyone friendly.
Self-targeted spell, as explained by @jmerry . Go in the middle of undead and cast it by exploding enemies around U. 💥
Good, at least, it works! 😉 Normally, the self-targeting of Sunray should be automatic. So, apparently, there is a little issue with its attachment to Daystar.
There is also a similar wizard spell Sunfire of level 5. 😎
Sunray is also a 7th level clerical spell. The description of that spell does indeed say that it is centered on the casting priest. However, in that instance the spell level is that of the caster, while using Daystar caps the casting level at 10.
The tricky part here is that the item ability is "cast normally", like how scrolls work. Which means your character has to go through the animation. If you issue another order, like clicking anywhere, before that animation is done, you cancel the ability. No Sunray, then. And because of the self-targeting, one click on the ability's icon was all you needed to start using the ability.