|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Glacius Tria is presumably mentioned or referenced because of its contemporary, Glacius Uno, in The Standard Book of Spells, Grade 3, published by Miranda Goshawk. With this assumtion, it is likely that it will also be acknowledged in the Glacius spellbook, which quite obviously contains data and instructions on the Glacius charm, and perhaps its more advanced counterparts. Even with this, Glacius Tria still remains to seem seldom used, and information along with utilisation have prevailed to a dubious archetype.
- Harry Potter and the Prisoner of Azkaban (video game) (First appearance)