ARCANE ADMIXTURE Prerequisite: 11th level any arcane class Benefit: Choose one arcane power that you know.and choose acid, cold, fire. lightning, or thunder. Thepower now deals that damage type in addition to its normal damage type and gains that keyword.
Burning Weapons Artificer Attack 1Encounter + Arcane, Fire, Weapon Standard Action Melee or Ranged weapon Target: One creature Attack: Intelligence vs. AC Hit: 1 [W] + Intelligence modifier fire damage. Until the end of your next turn, you and any ally within 2 squares of you deals extra fire damage equal to your Constitution modifier with weapon or fire attacks.
А про санблейд - доп дамаг всегда будет оставаться огненным
Damage TypesPage 276: After the first two paragraphs in theDamage Types section, add the following paragraph.This change reflects revisions in Player’s Handbook 3.It clarifies what happens to keywords when a power’sdamage type is changed.If the damage types in a power change, the powerboth loses the keywords for any damage types thatare removed and gains the keywords for any damagetypes that are added (the poison keyword is removedfrom a power only if that power neither deals poisondamage nor has any nondamaging effects). Forexample, if a wizard casts ray of frost through a flamingstaff and uses the staff ’s ability to change thedamage to fire, ray of frost gains the fire keyword andloses the cold keyword for that use, since the power isdealing fire damage instead of cold damage. That useof the power can therefore benefit from effects, likefeats, that affect fire powers, but not from effects thataffect cold powers.”