So I recently got both a lvl 5 Bulwark and a lvl 5 Slow Down and I don't know who to put it on. I'd appreciate any suggestions as to which heroes are best suited for these talents.
SD is only useful on heroes, which are needed in Lava or Demon/Archdemon fights for higher damage imo. If you have good DPS hero, which you want to use only for what i wrote above give it to that hero. I have is on TT with revive crest. Additional DPS in Lava4 and Boss fights is always good.
As for Bulwark it all depend on heroes you have. Overall it is good for DPS heroes (but not best) if you don't have good talents on them.