[Joseph Jostar]

A recent fix was introduced to cause non-standard damage-type tomes (such as slash/blunt/etc.) to default to the Fire element when using Elemental Rune. This currently applies only to Engraved Runes; Runes that are Triggered use the non-standard element and do not gain an increase to damage from elemental attack. 

This was tested against various mobs in singleplayer combat. The weapon used was a Cleaving Clarinet enchanted with Mutation to become a 'Tome' weapon that deals 'Blunt' damage.

Engraved:

System: * Initial Damage: 226 Fire Magic, flags: magic, sk: Elemental Rune (/obj/skill/spell/rune/elemental) , wep: Runic Recorder / /obj/items/equip/weapon/swords/cleaving_clarinet * play_atk_anim was . * 12 Evade VS 208 Hit. (Damage Hit Mod was 0) *2 Roll(s) Remaining. This one was a hit. GLANCE_CHECK_FIRST was enabled and the first hit roll was successful, so no glancing. * Critical check: Defender was critical immune or crit_multi was 0. (226) * spec_flat_reduc was 0. (226) * amp_multi was 1. (226) * reduc_multi was 97.3. (219.898); 2.7 MAG DEF, PHYS DEF, 100 REDUC * elem_reduc was 0. (219.898) * armor was allowed. armor_reduc was 0. (219.898) * Damage caps applied. (219.898) * Damage shields applied. (219.898) * Final damage was: 219.

Triggered:

System: * Initial Damage: 138.6 Blunt Magic, flags: magic, sk: Elemental Rune (/obj/skill/spell/rune/elemental) , wep: Runic Recorder / /obj/items/equip/weapon/swords/cleaving_clarinet * play_atk_anim was . * 12 Evade VS 208 Hit. (Damage Hit Mod was 0) *2 Roll(s) Remaining. This one was a hit. GLANCE_CHECK_FIRST was enabled and the first hit roll was successful, so no glancing. * Critical check: Defender was critical immune or crit_multi was 0. (138.6) * spec_flat_reduc was 0. (138.6) * amp_multi was 1. (138.6) * reduc_multi was 97.3. (134.858); 2.7 MAG DEF, PHYS DEF, 100 REDUC * elem_reduc was 0. (134.858) * armor was allowed. armor_reduc was 0. (134.858) * Damage caps applied. (134.858) * Damage shields applied. (134.858) * Final damage was: 134.

Triggered (Chrono Rune):

System: * Initial Damage: 322 Blunt Magic, flags: magic, no_evasion, sk: Elemental Rune (/obj/skill/spell/rune/elemental) , wep: Runic Recorder / /obj/items/equip/weapon/swords/cleaving_clarinet * play_atk_anim was . * Critical check: Defender was critical immune or crit_multi was 0. (322) * spec_flat_reduc was 0. (322) * amp_multi was 1. (322) * reduc_multi was 97.3. (313.306); 2.7 MAG DEF, PHYS DEF, 100 REDUC * elem_reduc was 0. (313.306) * armor was allowed. armor_reduc was 0. (313.306) * Damage caps applied. (313.306) * Damage shields applied. (313.306) * Final damage was: 313.

[Neus]

This has been corrected in 2.67.