Lore dump episode let's gooo
But, well, from the three favors Gaen asked from Koyomi as payment for helping with the Darkness, she asked him not to introduce her to Suruga as her relative, she thought it would be too inconvenient, that's why we have miss Oshino Izuko here.
Also, in the same arc we learn from Shinobu that this Heartspan is a replica of his old sword the First himself forged with his "blood and bones" (basically his vampiric abilities of creating matter) to slay her, but killed himself before doing so.
And about their immortality, Gaen mentioned the time Araragi burned under the sun, but we can also think of Mayoi Jiangshi, when the alternate timeline Kiss-Shot was unsuccessful on her suicide attempt by throwing herself under sunlight. Since that arc we already know her immortality is just too strong for it to work.
Episodes with the creepy old lady Izuko are always great fun.
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