Tyrian shields

The shield soaks up hits before your armor does, and it recharges during the level.

A shield regains one point every 15 frames, as long as your generator holds more energy than the shield's recharge cost; the cost is then taken from that energy. A stronger shield therefore competes with your guns for power. In two-player and Arcade games energy is always full.

Picture	Shield	Strength	Energy per point	Price	Sold in episodes
	Structural Integrity Field	2	100	100	1, 2, 4, 5
	Advanced Integrity Field	3	60	250	1, 2, 3, 4, 5
	Gencore Low Energy Shield	4	80	500	1, 2, 3, 4, 5
	Gencore High Energy Shield	5	120	1,000	1, 2, 3, 4, 5
	MicroCorp LXS Class A	6	160	2,000	1, 2, 3, 4, 5
	MicroCorp LXS Class B	7	120	4,000	2, 3, 4, 5
	MicroCorp LXS Class C	9	100	5,000	2, 3, 4
	Gencore Solar Shield	7	40	10,000	2, 3, 4, 5
	MicroCorp HXS Class A	10	180	12,000	1, 4
	MicroCorp HXS Class B	12	140	20,000	not sold
	MicroCorp HXS Class C	14	120	25,000	5