3 Fixed rules
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Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance deals 10d6 to a singleshatters an object at level 10, period, versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.

If the object in question is magical, Baleful Utterance allows for a fortitudewill save for half damageto negate, but Hammer Blast requires a ranged touch attack, so. It will be situational which is better.

Baleful Utterance scalesis much better even assumingin the rare instance when you are fighting a successfulcrystalline creature, dealing 1d6 per caster level up to a maximum of 10d6, fortitude savefor half. 

Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance deals 10d6 to a single object at level 10 versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.

If the object in question is magical, Baleful Utterance allows for a fortitude save for half damage, but Hammer Blast requires a ranged touch attack, so Baleful Utterance scales better even assuming a successful fortitude save.

Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance shatters an object, period, versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.

If the object in question is magical, Baleful Utterance allows for a will save to negate, but Hammer Blast requires a ranged touch attack. It will be situational which is better.

Baleful Utterance is much better in the rare instance when you are fighting a crystalline creature, dealing 1d6 per caster level up to a maximum of 10d6, fortitude for half. 

2 added 231 characters in body
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Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance deals 10d6 to a single object at level 10 versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.

If the object in question is magical, Baleful Utterance allows for a fortitude save for half damage, but Hammer Blast requires a ranged touch attack, so Baleful Utterance scales better even assuming a successful fortitude save.

Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance deals 10d6 to a single object at level 10 versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.

Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance deals 10d6 to a single object at level 10 versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.

If the object in question is magical, Baleful Utterance allows for a fortitude save for half damage, but Hammer Blast requires a ranged touch attack, so Baleful Utterance scales better even assuming a successful fortitude save.

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Baleful Utterance is usually going to be the better choice

Baleful Utterance is going to almost always be the better choice, given that it scales at more than twice the rate Hammer Blast does (Baleful Utterance deals 10d6 to a single object at level 10 versus Hammer Blast dealing 9d6 at level 20). In addition, Baleful Utterance has other uses, including the AoE effect of Shatter as well as forcing a Fortitude save versus being dazed and deafened if you single target an object a creature is wearing or holding. The only instance in which Hammer Blast might be better is if an object was resistant or immune to Sonic damage.