Dear Team!
Sorry for the delay, I have been held up at work. Here are my two cents:
Bulwark: love this. High usability, offers a lot of use until endgame for an adequate price.
Other helms: while I generally like the idea of the variation and get the synergy with the sunder charms, I feel these runewords overpriced as Io requires Nightmare farming. Considering that there are so many other options (OrtSol, peasant crown, Vampire, rockstopper) I feel that Either the Io should be reduced to another Rune available on normal difficulty, or all those helms should be buffed (proposal: +10-20 faster cast rate or/and +1 Skill). FCR is currently unavailable for helms (to craft) so this could justify Io and also ensure viability throughout hell. +1 Skill is acceptable as OrtSol offers that way cheaper (without the fcr). Still doesn’t beat a crafted Circlet or a Harle, but that is okay and a trade off.
Hustle: fun to play the first minute, but the Test Char should tear through nightmare like nothing (with the costs of the runes and knowing what equally expensive gear offers). So a Bit disappointing. Probably fun for speed runners that get that rune drop, other than that hardly viable.
Mosaic: hardly ever Play Assassin so I lack competence for qualified feedback
Metamorphosis: fun to watch, nice alteration of game mechanics (sorta D4 style), but I hardly ever play Druid, so my feedback is limited. My impression was that on P1 this should enable a Druid to tear through his enemies, but that was not the case