Speak to Myranda to gain the Scarlet Illusion. Travel to Hearthglen while under the Scarlet Illusion and deliver Tirion's Gift to Highlord Taelan Fordring. Hearthglen is to the north, Taelan should be inside of Mardenholde Keep.
I am what you would call, an illusionist. Though I may be able to create an illusion to allow you entry into Hearthglen, be warned; my powers have their limitations.
Should you travel too far from these lands, the effects of the illusion will cease. The spell itself takes a great amount of concentration and power from me, and thus, I can only sustain the effect for a short time.
Speak to me again when you are ready.