Glass Citadel Upgrades (glass circle units only)

	name	costs	prerequesites	effects
	Needle-Sharp Glass	7575		+15% attack
	Jagged Glass	125125	great city, Needle-Sharp Glass	+25% attack
	Armored Glass	7575		+10% health
	Impervious Glass	125125	great city, Armored Glass	+20% health
	Dark Glass	100100	great city	Power of Glass: corruption attack (lower target's health) Glass Shock power (brief destruction wave) glass spiders: Glass Web power (imprison target)
	Elder Dragon Upgrade	6001600		turns glass dragon into elder glass dragon with greater powers

Glass Citadel Upgrades (upgrades effect ALL units)

	name	costs	prerequesites	effects
	Dark Glass Protection	2550	none	all alin buildings gain +5% hit points
	Dark Glass Defense	100100	great city, Dark Glass Protection	all alin buildings gain +10% hit points
	Dark Glass Armor	150200	great city, Dark Glass Defense	all alin buildings gain +15% hit points
	Glass Magic	250	large city, Call the Flame	attrition in enemy territory reduced by 75% for all alin units