[Senna]

Placed

System: Debug: Total Power for Elemental Rune / was 0.
System:System: Debug: Total Power for Elemental Rune / was 0.
Prinny takes 84 Sound magical damage. (Elemental Rune / Screaming Tome)
System:
* Initial Damage: 84 Sound Magic, flags: magic, magic, sk: Elemental Rune (/obj/skill/spell/rune/elemental) , wep: Screaming Tome / /obj/items/equip/weapon/tomes/screaming_tome
* play_atk_anim was .
* 15 Evade VS 249 Hit (234%). (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. (84)
* spec_flat_reduc was 0. (84)
* amp_multi was 1. (84)
* reduc_multi was 100. (84); 0 MAG DEF, PHYS DEF, 100 REDUC
* elem_reduc was 0. (84)
* armor was allowed. armor_reduc was 0. (84)
* Damage caps applied. (84)
* Damage shields applied. (84)
[size=small][font=Times New Roman][font=Tahoma]* Final damage was: 84.

[color=#000000]Engraved

System: Debug: Total Power for Elemental Rune / Screaming Tome was 112.

Prinny takes 182 Sound magical damage. (Elemental Rune / Screaming Tome)
System:
* Initial Damage: 182 Sound Magic, flags: magic, magic, sk: Elemental Rune (/obj/skill/spell/rune/elemental) , wep: Screaming Tome / /obj/items/equip/weapon/tomes/screaming_tome
* play_atk_anim was .
* 15 Evade VS 249 Hit (234%). (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. (182)
* spec_flat_reduc was 0. (182)
* amp_multi was 1. (182)
* reduc_multi was 100. (182); 0 MAG DEF, PHYS DEF, 100 REDUC
* elem_reduc was 0. (182)
* armor was allowed. armor_reduc was 0. (182)
* Damage caps applied. (182)
* Damage shields applied. (182)
* Final damage was: 182.

From my understanding, placed runes total power isn't applying.