Bring back the original Bat Swarm stats and make that legendary mount cost 75,000,000 AD and it cannot be discounted. Leave that out for 2 weeks. Than swap it over to an updated T-Rex that has 4K Power, provides the standard 10% debuff but also provide a damage buff of 10%. Make this one cost again 75,000,000 for 2 weeks. Continue doing this every two weeks and change up the legendary mount but update it to include a debuff and damage buff so that it is an incentive to get for BiS players.
Add new Legendary Companion packs as well cost 75,000,000 AD. The pack includes a Legendary Companion, R14 Bondings, Gear and player choice of 6 R14 enchantments. This pack would contain a modified prior companion such as Legendary Air Cultist Archon - this archon provides 7% damage buff and does the same debuff, etc...
These two ideas will help remove some of the AD that is sitting on some characters.
What do you all think of these AD sinks? Would you be willing to drop say 75M AD for a stronger legendary mount or a updated Legendary companion with better stats?