dragons that one shot you are as follows: Greater mithril in sanctuary fel, greater mithril in T2A fel, mithril serpentine outside of fel ice dungeon. these do a fire breath. the ancients , gems, spirillex, stygian and dracoliche dragons do a max of 250 damage with their fire breath. the latter can all be soloed using a good slayer weapon, vampiric embrace, curse weapon, enemy of one, consecrate weapon, gift of life, gift of renewal and casting poison field on yourself to avoid the fire wall they all cast. You will need the max hit points of 300 to survive. They can still kill you when they cast fire breath and bite you simultaneously. The latter dragons do not one shot you. As the dragons lose their hit points, their breath weapon does less damage to you. Always divine fury after being hit with the breath weapon so your bandies are at the maximum speed. good luck
