Soul shop

Relics
Mighty Hammer

Level 1 - Required to build the Kitchen - Free

Level 2 - Required to build the Juicer - Costs 2.5k Souls

Level 3 - Required to build the Smuggler's Bay - Costs 25k Souls

Level 4 - Required to upgrade the Mechanics - Costs 250k Souls

Ancient Sceptre

Level 1 - Permanently unlock the spell 'Unholy Bind' - Costs 1k Souls

Level 2 - Permanently unlock the spell 'Metamorphose' - Costs 25k Souls

Level 3 - Permanently unlock the spell 'Hell Fury' - Costs 100k Souls

Level 4 - Permanently unlock the spell 'Treachery' - Costs 5m Souls

Rooms
Generator IV

Permanently unlock another Combat Generator! - Costs 1k Souls

HR Department

Increase offline productivity here, bureaucratically. - Costs 50k Souls

Arbitrarium

Permanently unlock another Arbitrarium! - Costs 100k Souls

Mine

Permanently unlock another Mine! - Costs 1m Souls

Creature Skins
Pirate

Unlock this Rare Skin permanently, unlock powerful boosts. - Costs 500k Souls

Oni

Unlock this Rare Skin permanently, unlock powerful boosts. - Costs 100m Souls

Snow Queen

Unlock this Rare Skin permanently, unlock powerful boosts. - Costs 500m Souls

Merman

Imp skin. Upgrade to boost Imp's Damage and drops. - Costs 1b Souls