According to the calculator, crumble Undead gives 24.5 xp. However, that is only the base xp for the spell, not factoring in damage hit on average. This is inconsistent with others, where they do factor in damage hit. Example: Fire bolt gives 21.5 base xp. But the calculator says it gives 34.5. All well and good, but the crumble undead spell, teh average damage is not factored in. It hits a max of 15. Im not totally sure of the way you work it out, but it seems to me it should give between 14 and 16 extra xp with the damage factored in, thus equalling 38.5-40.5 xp per spell.

Yeah, Crumble hits up to 15, so I'd say around 7.5 average, which'd up the average xp a bit. On the other hand, I recall Jagex nerfing Crumble xp quite a while back because it made levelling too easy / cheap. I'll look into it tomorrow.

 

 

 

Edit: assuming 7.5 average and indeed 2 xp per damage, upped the xp with 15 to 39.5.

 

 

 

Cheers, and locked.