One of the loading screens mentions that there are some extra strong magic combos.
So what are those combinations and what is their effect?
Are there also special combos for warrior/rogue-skills?
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Sign up to join this communitySpell Combination Result Grease + Any Fire Spell Grease Fire Death Hex + Death Cloud Entropic Death Glyph of Paralysis + Glyph of Replusion Paralysis Explosion Spell Might + Blizzard + Tempest Storm of the Century Grease Fire + Blizzard Flame-Quencher Force Field + Crushing Prison Shockwave Vulnerability Hex + Drain Life/Mana Drain Improved Drain Spell Might + Animate Dead Advanced Reanimation Sleep + Horror Nightmare
This one's slightly different, but in the same vein: Hit a target that is Petrified/Frozen, then get a Critical Hit or use Stone Fist/Crushing Prison and they will Shatter, which is an instant kill.
In regards to your bonus question, no, there's not really an equivalent functionality with warrior/rogue talents. There are tactical synergy options, like having your melee characters hit frozen/petrified targets to one-shot them. Rogues also get a Coup de Grace talent which does additional damage against stunned/paralyzed targets, so you could send them after enemies your mage mezzes. But there are not really "combos" in the same way that the mage spells work.