Around half health, the healer will acknowledge that you've got strength, but summon a might holy hammer, swing it in an arc the direction of his face to Elden Ring Runes gain momentum. Then, it will fly into the airand then smash it down on top of you. Return to the original swing, and wait until he's about to crash down to get out of the way of the hammer and take a retaliation - but be prepared to strike again with a dagger.
He may also summon a longer golden sword blade with greater reach than daggers. He may use it in conjunction with his cane in order to spin combo slashes that are tough to avoid. He can also end by hitting with the weapon he uses as his main staff weapon.
Margit isn't always easy to anticipate which magical weapon will be summoned and how he'll include them in the combo attack, so it is essential to keep the stamina to avoid or stop the next attack. If you have an adequate absorbent shield, you could even use Guard Counters with the condition that you ensure that you've completed your combo attack before you begin your counter. If not, you'll be more vulnerable when you're committed to the attack.
You should take your time in this battle and watch him move slowly enough for you to have time to observe his animations and learn when it is appropriate for your own attempts - and never get too eager to be too stingy, leaving yourself vulnerable. Melee fighters should back off periodically to replenish their stamina, and wait for him to make his first move so you can respond accordingly.Get your strikes in as you can to slowly whittle Margit down, and he'll drop with enough time in Cheap Elden Ring Runes the process, allowing you to get to Stormveil Castle proper.