Bolt spell

A bolt spell is any attack spell that is based on the caster's Spell Aiming skill. These spells benefit from a more offensive stance, but only result in a three (3) second cast roundtime, rather than a true three (3) second roundtime. There are two types of bolt spells: true bolt spells and ball spells.

Ball Spells

Ball spells are a subgroup of bolt spells that do less damage on a single target but have the ability to perform additional splash damage on several creatures (including the original target) due to explosion of the ball upon impact. Two rolls determine how many creatures you hit, and there is a skill that influences each of the two rolls. The first roll determines how many creatures it is possible to splash and is influenced by a different lore depending on the spell: Elemental Lore, Fire for Major Fire (908), Elemental Lore, Water for Major Cold (907) or Spiritual Lore, Summoning for Fire Spirit (111). Major Acid (926) has no influencing lore. The second roll determines how many creatures are actually splashed, with the first roll determining the maximum of the second. MOC increases the minimum for this roll.

For example, let's say you've trained enough in Elemental Lore, Fire to increase the minimum possible number of creatures splashed to five with Major Fire and have trained six times in MOC. With twenty creatures in the room, your first roll can be between five and twenty. It rolls a seven, meaning you can hit up to twelve creatures. The next roll, due to your six ranks of MOC, can be anything between six and twelve. It rolls a one, resulting in splash damage to seven creatures. It should also be noted that the first roll takes precedence, such that if your maximum possible number of creatures hit is two, you will not hit more than two, regardless of MOC training.

For those who prefer a more intuitive explanation, the appropriate lore determines the minimum size of the explosion caused by the spell whereas MOC determines how well you can place the explosion such that it hits the most targets.

As a final note, the above is only documented for Fire Spirit, and though it seems all ball spells work the same way, it's possible that the above does not hold true for the others.

Damage Factors

Spell	Robes	Soft Leather	Hard Leather	Chain	Plate
111	0.400	0.333	0.270	0.256	0.244
306	0.750	0.500	0.405	0.400	0.265
505	0.530	-	-	-	-
510	0.710	0.520	0.460	0.435	0.440
901	0.150	0.133	0.111	0.122	0.128
903	0.455	0.345	0.283	0.242	0.173
904	0.525	0.383	0.314	0.350	0.197
906	0.667	0.455	0.345	0.323	0.303
907	0.445	0.350	0.245	0.217	0.208
908	0.400	0.333	0.270	0.256	0.244
910	0.750	0.555	0.434	0.415	0.433
926	0.600	0.335	0.275	0.370	0.196
928	0.667	0.460	0.385	0.375	0.355
1110	0.750	0.500	0.405	0.400	0.265

AvDs

Spell	Robes	Soft Leather				Hard Leather				Chain				Plate
AsG	1	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
901	35	25	24	23	22	30	28	26	24	33	29	25	21	36	30	24	18
903	30	30	29	28	27	29	27	25	23	31	27	23	19	25	19	13	7
904	40	38	37	36	35	35	33	31	29	37	33	29	25	32	26	20	14
906	55	37	36	35	34	33	31	29	27	42	38	34	30	44	38	32	26
907	65	55	54	53	52	45	43	41	39	40	36	32	28	35	29	23	17
908	70	60	59	58	57	50	48	46	44	45	41	37	33	40	34	28	22
910	50	40	39	38	37	45	43	41	39	48	44	40	36	51	45	39	33