RF15-124: Combo skills. A successful cast can offer its linked combo skills in the combo window, and casting one can offer the next.
RF15-125: Kill count and time attack. Killing enough of a monster pays its kill-count reward, time-attack windows open and pay out, and the game announces both.
RF15-117: Cheating cards. Monsters always showed a blank card; they now draw a card when they spawn, and a matching card pays an item from that card's loot list.
Aimed debuffs. A debuff skill cast on a monster or player landed on the caster instead of the target.