Undyne is the head of the royal guard, she has 1600 HP, she can summon spears to shoot or summon from the ground to impale people, even when her HP is 0 she can still fight, her determination will revive her as undyne the undying, this time having 23000 HP her attacks become faster and stronger, she can turn people's soul green so they can only block, too much determination will cause her to melt.