Well I figured out why Malistaire went to each world and why he summoned the Dragon Titan.
Wizard City-Portal Key to Krokotopia Krokotopia- spells of life and death in the Krokonomikon Marleybone-he did not get the Krokonomikon in Krok. so he hired Meowiarty as qouted "a clever and dangerous thief" to find and steal it. MooShu- The Imperial Summoning Candles, and key to Dragonspyre Dragonspyre- Summon the Dragon Titan
How they were attacked and why Wizard City-Corruption and summoning of dead spirits, in hopes of destroying Wizard City and revenge Krokotopia- madness, not truly intentionally caused but by awakening Krokopatra he caused the enslavement of the manders to continue Marleybone- nothing really done but Meowiarty's breakout, rest caused by O'Learys MooShu-Onis were revived to harm MooShu and harm of the Emperor, Distraction and to get the Dragonspire Portal Key and revenge for the Emperor's refusal Dragonspyre-Dragon Titan's Armies, Dragon Titan Summoning
How I know Gathering facts from around the Spiral Look at Malistaire's energy sphere and you can see everything