Khadi's channeling, however, remains extra effective... but again, it shrugs off some of the damage.
Situation so far
Small undead, AC 16, DR 5
Immune to flanking and critical hits
Vulnerable to channeled energy
Damage: 34 (out of 65 max)
Rolls
Fort save DC 16 vs 25 damage - (1d20+7)
(9) + 7 = 16