It is part of the plot that you loose the teleporter stones in act 4. There probably should have been another cut scene with the imp historian, or something, to inform people of this.
I've found Pag-Ydra (large strength) charms, but no Yit-Ydra (very large strength) charms. However, with only 4 or 5 Yit (gold) charms that doesn't mean much (in act 3 I have not yet checked the BF for charms, etc).
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