Decoy vs. Valkyrie

[whyBish]

you can always recast your decoy on the other side of the mob if it's in any danger of trapping someone, and sometimes it's useful to block monsters.

she took out the hell/ancients more or less on her own. One of them had holy shock, and after isolating two ancients on my valk (they could barely scratch her)

Yes you can recast decoy, but she requires LoS to recast, and in maggot lair sometimes can take a few attempts (especially when aiming near corners)

I believe that the valk tank ability is due to her regen and not to her hitpoints. If she gets poisoned she tends to go down rather quickly, if she is majorly damaged she seems to regen to full in about 5-7 seconds (meaning that poison is almost a requisite to kill a decent level valk)