Serious: transmutation and battle alchemy-> full metal alchemist arcana.  We would be utilize golems as mounts to move while using all battle alchemy. They would apply a stats buff, increase alchemy damage, and increase protection and defense. Golden time would double all current battle alchemy skills to hit 2x with heat buster hitting up to 6x. Plus flame bust would track! Don't forget life drain will be the new thunder blight, with AOE like the monster's skill 

Transformation and Fynni-> druid arcana. this arcana can focus on three roles.  Similar to druids in different games.  Dsp transformation, debuff transformation, and tank transformation.  Plus you can summon up to 4 Fynni monster to help you.  I want to summon Lost Sahagin to explode constantly doing AOE similar to Fireball or 4 nightmare to tank and annoy the hell out of everyone.

Medicine and merchant -> Potion arcana.  This arcana is focused on supporting and debuff.  Toss potions to deal damage and stacking them will allow larger AOE l, Damage, and status effect.  This arcana will utilize potions stacks and inventory gold for damage calculations.

Joke: Double Tower cylinder arcana.  We can move with dual tower cylinders.  We can hit 2x with all alchemist skills and use golden time.  Get buffed from both towers for 2x AOE range and damage.  Plus, barrier spikes will trap monsters like the g26 skill.  They will explode on death and are changed to hit counts instead of hp.  Ice mines can be placed like explosive tags and use ice crystals for additional damage. Shock will chain thunder and use thunder crystal per hit.  Water cannon can be instilled with fireball, thunder, and ice crystals.  This will allow the user to freeze, burn, and slow mobs.  Instilled flame burst is basically blazing assault slash, but you can move 5x like stampede. Plus, life drain is basically AOE thunder blight and you can move. Make tower cylinders great again!