
derart
so / such
An adverb used to emphasize a high degree or extreme extent of something; in such a way, to such an extent.
Der Sturm war derart stark, dass mehrere Bäume umstürzten.
The storm was so strong that several trees fell over.
so / such
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so / such
An adverb used to emphasize a high degree or extreme extent of something; in such a way, to such an extent.
Der Sturm war derart stark, dass mehrere Bäume umstürzten.
The storm was so strong that several trees fell over.
'Derart' (so / such) is composed of 'der' and 'Art' (kind/type). It literally means 'of this kind' or 'in this way' and expresses a high degree.
Eine derartige Unfreundlichkeit habe ich noch nie erlebt.
I have never experienced such unfriendliness before.
Very often, 'derart' (so / such) introduces a consecutive clause that begins with 'dass' (that). The structure is: 'derart + adjective/adverb, dass ...' (so + adjective/adverb that ...).
Er war derart müde, dass er sofort einschlief.
He was so tired that he fell asleep immediately.
'Derart' (so / such) belongs more to written language or a more formal style. In everyday spoken language, the simpler word 'so' (so) is usually used.
Die Preise sind derart gestiegen, dass sich viele Menschen das Heizen kaum noch leisten können.
Prices have risen so much that many people can hardly afford heating anymore.
then
The stated meaning of „dann“ introduces the result of a condition. „Derart“, by contrast, indicates a high degree or a particular manner and is not suitable for expressing a conditional result in this meaning. Use „dann“ after a condition; „derart“ is used only to indicate degree or manner.

Derart starke Kopfschmerzen hatte ich bisher noch nie.
I have never had such severe headaches before.
Wenn du heute Zeit hast, dann können wir gemeinsam lernen.
If you have time today, then we can study together.