Please explain to me what a sigil is and perhaps I can answer your question.

ok.first of all are you talking about sigils for spirit shields or what?? well anyway, sigil's come in a couple kinds here are a few: Elysian sigil, spectral sigil, arcane sigil, divine sigil, u have to do spirit of summer to even wield a spirit shield. also sigils get droped by corporal beast like 703+ idk,sorry if i was no help divine sigil owns =P.. ^.^ if nothing i said was right look it up on runehq.com

The Stark sigil is a grey direwolf on a white field.

if you have the lighter and the bar of soap then use the lighter on the sigil it heats up and then use the soap

The legend is that a Duke named Bruncvík set off on a quest to get a better sigil then eagle. On his travels he saved Lions live and with him slayed a dragon. Upon his return he decided to take thelion as his Sigil. Afterwards even though his house sigil remained eagle the duchy and later kingdom of bohemia kept lion as a sigil.