Star Sigil

Star Sigils are used to rank up Artifacts and are gained mainly from Dragon Invasion.
Approximate Star Sigils needed per Artifact rank up
 	Green	Blue	Purple	Orange	Bonus
0☆→1☆	? 	? 	? 	600 	+20%
1☆→2☆	230 	382 	763 	1612 	+40%
2☆→3☆	353 	619 	1591 	? 	+70%
3☆→4☆	535 	1071	2462 	? 	+100%
4☆→5☆	768 	? 	? 	? 	+150%